Fix incorrect tailwind migration (#30007)

Fixes https://github.com/go-gitea/gitea/issues/30005. Regression from
https://github.com/go-gitea/gitea/pull/29945.

There was only once instance of `tw-content-center` before that PR, so I
just ran below command and reverted that one instance.

```sh
perl -p -i -e 's#tw-content-center#tw-items-center#g' web_src/js/**/* templates/**/* models/**/* tests/**/*
```

web_src/js/components/ActionRunStatus.vue

@@ -28,7 +28,7 @@ export default {
 };
 </script>
 <template>
-  <span class="tw-flex tw-content-center" :data-tooltip-content="localeStatus" v-if="status">
+  <span class="tw-flex tw-items-center" :data-tooltip-content="localeStatus" v-if="status">
     <SvgIcon name="octicon-check-circle-fill" class="text green" :size="size" :class-name="className" v-if="status === 'success'"/>
     <SvgIcon name="octicon-skip" class="text grey" :size="size" :class-name="className" v-else-if="status === 'skipped'"/>
     <SvgIcon name="octicon-clock" class="text yellow" :size="size" :class-name="className" v-else-if="status === 'waiting'"/>

web_src/js/components/DashboardRepoList.vue

@@ -345,12 +345,12 @@ export default sfc; // activate the IDE's Vue plugin
       <a :class="{item: true, active: tab === 'organizations'}" @click="changeTab('organizations')">{{ textOrganization }}</a>
     </div>
     <div v-show="tab === 'repos'" class="ui tab active list dashboard-repos">
-      <h4 class="ui top attached header tw-flex tw-content-center">
-        <div class="tw-flex-1 tw-flex tw-content-center">
+      <h4 class="ui top attached header tw-flex tw-items-center">
+        <div class="tw-flex-1 tw-flex tw-items-center">
           {{ textMyRepos }}
           <span class="ui grey label gt-ml-3">{{ reposTotalCount }}</span>
         </div>
-        <a class="tw-flex tw-content-center muted" :href="subUrl + '/repo/create' + (isOrganization ? '?org=' + organizationId : '')" :data-tooltip-content="textNewRepo">
+        <a class="tw-flex tw-items-center muted" :href="subUrl + '/repo/create' + (isOrganization ? '?org=' + organizationId : '')" :data-tooltip-content="textNewRepo">
           <svg-icon name="octicon-plus"/>
         </a>
       </h4>
@@ -411,7 +411,7 @@ export default sfc; // activate the IDE's Vue plugin
       </div>
       <div v-if="repos.length" class="ui attached table segment tw-rounded-b">
         <ul class="repo-owner-name-list">
-          <li class="tw-flex tw-content-center gt-py-3" v-for="repo, index in repos" :class="{'active': index === activeIndex}" :key="repo.id">
+          <li class="tw-flex tw-items-center gt-py-3" v-for="repo, index in repos" :class="{'active': index === activeIndex}" :key="repo.id">
             <a class="repo-list-link muted" :href="repo.link">
               <svg-icon :name="repoIcon(repo)" :size="16" class-name="repo-list-icon"/>
               <div class="text truncate">{{ repo.full_name }}</div>
@@ -419,7 +419,7 @@ export default sfc; // activate the IDE's Vue plugin
                 <svg-icon name="octicon-archive" :size="16"/>
               </div>
             </a>
-            <a class="tw-flex tw-content-center" v-if="repo.latest_commit_status_state" :href="repo.latest_commit_status_state_link" :data-tooltip-content="repo.locale_latest_commit_status_state">
+            <a class="tw-flex tw-items-center" v-if="repo.latest_commit_status_state" :href="repo.latest_commit_status_state_link" :data-tooltip-content="repo.locale_latest_commit_status_state">
               <!-- the commit status icon logic is taken from templates/repo/commit_status.tmpl -->
               <svg-icon :name="statusIcon(repo.latest_commit_status_state)" :class-name="'gt-ml-3 commit-status icon text ' + statusColor(repo.latest_commit_status_state)" :size="16"/>
             </a>
@@ -458,18 +458,18 @@ export default sfc; // activate the IDE's Vue plugin
       </div>
     </div>
     <div v-if="!isOrganization" v-show="tab === 'organizations'" class="ui tab active list dashboard-orgs">
-      <h4 class="ui top attached header tw-flex tw-content-center">
-        <div class="tw-flex-1 tw-flex tw-content-center">
+      <h4 class="ui top attached header tw-flex tw-items-center">
+        <div class="tw-flex-1 tw-flex tw-items-center">
           {{ textMyOrgs }}
           <span class="ui grey label gt-ml-3">{{ organizationsTotalCount }}</span>
         </div>
-        <a class="tw-flex tw-content-center muted" v-if="canCreateOrganization" :href="subUrl + '/org/create'" :data-tooltip-content="textNewOrg">
+        <a class="tw-flex tw-items-center muted" v-if="canCreateOrganization" :href="subUrl + '/org/create'" :data-tooltip-content="textNewOrg">
           <svg-icon name="octicon-plus"/>
         </a>
       </h4>
       <div v-if="organizations.length" class="ui attached table segment tw-rounded-b">
         <ul class="repo-owner-name-list">
-          <li class="tw-flex tw-content-center gt-py-3" v-for="org in organizations" :key="org.name">
+          <li class="tw-flex tw-items-center gt-py-3" v-for="org in organizations" :key="org.name">
             <a class="repo-list-link muted" :href="subUrl + '/' + encodeURIComponent(org.name)">
               <svg-icon name="octicon-organization" :size="16" class-name="repo-list-icon"/>
               <div class="text truncate">{{ org.name }}</div>
@@ -479,7 +479,7 @@ export default sfc; // activate the IDE's Vue plugin
                 </span>
               </div>
             </a>
-            <div class="text light grey tw-flex tw-content-center gt-ml-3">
+            <div class="text light grey tw-flex tw-items-center gt-ml-3">
               {{ org.num_repos }}
               <svg-icon name="octicon-repo" :size="16" class-name="gt-ml-2 gt-mt-1"/>
             </div>

web_src/js/components/DiffFileList.vue

@@ -38,7 +38,7 @@ export default {
 <template>
   <ol class="diff-stats gt-m-0" ref="root" v-if="store.fileListIsVisible">
     <li v-for="file in store.files" :key="file.NameHash">
-      <div class="gt-font-semibold tw-flex tw-content-center pull-right">
+      <div class="gt-font-semibold tw-flex tw-items-center pull-right">
         <span v-if="file.IsBin" class="gt-ml-1 gt-mr-3">{{ store.binaryFileMessage }}</span>
         {{ file.IsBin ? '' : file.Addition + file.Deletion }}
         <span v-if="!file.IsBin" class="diff-stats-bar gt-mx-3" :data-tooltip-content="store.statisticsMessage.replace('%d', (file.Addition + file.Deletion)).replace('%d', file.Addition).replace('%d', file.Deletion)">
@@ -50,7 +50,7 @@ export default {
       <a class="file gt-mono" :href="'#diff-' + file.NameHash">{{ file.Name }}</a>
     </li>
     <li v-if="store.isIncomplete" class="gt-pt-2">
-      <span class="file tw-flex tw-content-center tw-justify-between">{{ store.tooManyFilesMessage }}
+      <span class="file tw-flex tw-items-center tw-justify-between">{{ store.tooManyFilesMessage }}
         <a :class="['ui', 'basic', 'tiny', 'button', store.isLoadingNewData ? 'disabled' : '']" @click.stop="loadMoreData">{{ store.showMoreMessage }}</a>
       </span>
     </li>

web_src/js/components/RepoBranchTagSelector.vue

@@ -246,7 +246,7 @@ export default sfc; // activate IDE's Vue plugin
 <template>
   <div class="ui dropdown custom">
     <button class="branch-dropdown-button gt-ellipsis ui basic small compact button tw-flex gt-m-0" @click="menuVisible = !menuVisible" @keyup.enter="menuVisible = !menuVisible">
-      <span class="text tw-flex tw-content-center gt-mr-2">
+      <span class="text tw-flex tw-items-center gt-mr-2">
         <template v-if="release">{{ textReleaseCompare }}</template>
         <template v-else>
           <svg-icon v-if="isViewTag" name="octicon-tag"/>

web_src/js/components/RepoCodeFrequency.vue

@@ -144,7 +144,7 @@ export default {
 </script>
 <template>
   <div>
-    <div class="ui header tw-flex tw-content-center tw-justify-between">
+    <div class="ui header tw-flex tw-items-center tw-justify-between">
       {{ isLoading ? locale.loadingTitle : errorText ? locale.loadingTitleFailed: `Code frequency over the history of ${repoLink.slice(1)}` }}
     </div>
     <div class="tw-flex ui segment main-graph">

web_src/js/components/RepoContributors.vue

@@ -303,7 +303,7 @@ export default {
 </script>
 <template>
   <div>
-    <div class="ui header tw-flex tw-content-center tw-justify-between">
+    <div class="ui header tw-flex tw-items-center tw-justify-between">
       <div>
         <relative-time
           v-if="xAxisMin > 0"

web_src/js/components/RepoRecentCommits.vue

@@ -121,7 +121,7 @@ export default {
 </script>
 <template>
   <div>
-    <div class="ui header tw-flex tw-content-center tw-justify-between">
+    <div class="ui header tw-flex tw-items-center tw-justify-between">
       {{ isLoading ? locale.loadingTitle : errorText ? locale.loadingTitleFailed: "Number of commits in the past year" }}
     </div>
     <div class="tw-flex ui segment main-graph">

web_src/js/features/repo-issue-content.js

@@ -16,7 +16,7 @@ function showContentHistoryDetail(issueBaseUrl, commentId, historyId, itemTitleH
   $dialog = $(`
 <div class="ui modal content-history-detail-dialog">
   ${svg('octicon-x', 16, 'close icon inside')}
-  <div class="header tw-flex tw-content-center tw-justify-between">
+  <div class="header tw-flex tw-items-center tw-justify-between">
     <div>${itemTitleHtml}</div>
     <div class="ui dropdown dialog-header-options gt-mr-5 gt-hidden">
       ${i18nTextOptions}