Remove commented out code

lib/ui/viewer/file/thumbnail_widget.dart

@@ -170,11 +170,6 @@ class _ThumbnailWidgetState extends State<ThumbnailWidget> {
     }
     final List<Widget> viewChildren = [
       const ThumbnailPlaceHolder(),
-      // AnimatedOpacity(
-      //   opacity: content == null ? 0 : 1.0,
-      //   duration: const Duration(milliseconds: 200),
-      //   child: content,
-      // )
       content ?? const SizedBox(),
     ];
     if (widget.shouldShowSyncStatus && widget.file!.uploadedFileID == null) {