Fix JSX syntax errors in admin pages

Remove duplicate closing div tags that caused build errors:
- Fix devices page JSX structure
- Fix users page JSX structure

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/admin/devices/page.tsx

@@ -343,7 +343,6 @@ export default function DevicesPage() {
                 </div>
               )}
           </div>
-          );
         })}
       </div>
 

app/admin/users/page.tsx

@@ -331,7 +331,6 @@ export default function UsersPage() {
                 </button>
               </div>
             )}
-          </div>
         ))}
       </div>