gh-14521: Fixed theme settings group being visible (gh-14524)

src/browser/themes/shared/preferences/zen-preferences.css

@@ -484,11 +484,10 @@ groupbox h2 {
 #helpButton,
 #support-firefox,
 #tabGroupSuggestions,
-#web-appearance-manage-themes-link,
 #setting-control-sidebarChatbotFieldset,
 #setting-control-supportFirefox,
 .mission-message,
-html|setting-group:is([data-subcategory="layout"], [groupid="support"]) {
+html|setting-group:is([data-subcategory="layout"], [groupid="support"], [groupid="browserTheme"]) {
   display: none !important;
 }