emoji [nfc]: Cut a comment on reasoning for not animating emoji

My comment here seemed unnecessarily judgy on a second reading;
there are multiple valid reasons to disable animated emoji, like to
save battery or to accommodate epilepsy or other neurological
differences.

Author: chrisbobbe

lib/widgets/emoji.dart

@@ -123,7 +123,6 @@ class ImageEmojiWidget extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    // Some people really dislike animated emoji.
     final doNotAnimate =
       neverAnimate
       // From reading code, this doesn't actually get set on iOS: