[mob][photos] Increase loading iconSize + reduce padding (#1499)

## Description


https://github.com/ente-io/ente/assets/254676/94f15baf-d350-4738-879e-ad163a1e4b45


## Tests

mobile/lib/ui/viewer/file_details/favorite_widget.dart

@@ -44,7 +44,8 @@ class _FavoriteWidgetState extends State<FavoriteWidget> {
         final bool isLiked = snapshot.data ?? false;
         return _isLoading
             ? const EnteLoadingWidget(
-                size: 12,
+                size: 14,
+                padding: 2,
               ) // Add this line
             : LikeButton(
                 size: 24,