chore: Rollback from new folder animation until release (#10451)

* chore: Rollback from new folder animation until release, b=no-bug, c=tabs, folders

* chore: Revert changes for folder tabs unload, b=no-bug, c=folders

src/zen/folders/ZenFolder.mjs

@@ -144,10 +144,6 @@
       return activeGroups;
     }
 
-    get childActiveGroups() {
-      return Array.from(this.querySelectorAll('zen-folder[has-active]'));
-    }
-
     rename() {
       if (!document.documentElement.hasAttribute('zen-sidebar-expanded')) {
         return;
@@ -271,10 +267,9 @@
     }
 
     async #unloadAllActiveTabs(event, noClose = false) {
-      await gZenPinnedTabManager._onCloseTabShortcut(event, this.tabs, {
-        noClose,
-        folderToUnload: this,
-      });
+      for (const tab of this.tabs) {
+        await gZenPinnedTabManager._onCloseTabShortcut(event, tab, { noClose });
+      }
       this.activeTabs = [];
     }