Fix bad way of using vite

Previously fixed but managed to sneak back in #4995

Author: olipayne

src/config/backpack/ui.php

@@ -106,7 +106,7 @@
     // CSS files that are loaded in all pages, using Laravel's @vite() helper
     // Please note that support for Vite was added in Laravel 9.19. Earlier versions are not able to use this feature.
     'vite_styles' => [ // resource file_path
-        // 'resources/css/app.css' => '',
+        // 'resources/css/app.css',
     ],
 
     // --------------