fix: remove stray </div> in Email/Calendar/Files pages that broke vite build

Stray closing div was left in the ternary falsy branch after AdminConfigSection
was moved outside the ternary. esbuild interpreted it as an unterminated regex.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

webui/src/pages/services/CalendarPage.jsx

@@ -308,8 +308,6 @@ export default function CalendarPage() {
           </div>
         )}
       </div>
-
-      </div>
       )}
 
       {isAdmin && activeTab !== 'accounts' && (

webui/src/pages/services/EmailPage.jsx

@@ -312,8 +312,6 @@ export default function EmailPage() {
           </div>
         )}
       </div>
-
-      </div>
       )}
 
       {isAdmin && activeTab !== 'accounts' && (

webui/src/pages/services/FilesPage.jsx

@@ -312,8 +312,6 @@ export default function FilesPage() {
           </div>
         )}
       </div>
-
-      </div>
       )}
 
       {isAdmin && activeTab !== 'accounts' && (