chore: Follow up stickers

lib/pages/chat/events/image_bubble.dart

@@ -36,11 +36,6 @@ class ImageBubble extends StatelessWidget {
   });
 
   Widget _buildPlaceholder(BuildContext context) {
-    if (event.messageType == MessageTypes.Sticker) {
-      return const Center(
-        child: CircularProgressIndicator.adaptive(),
-      );
-    }
     final String blurHashString =
         event.infoMap['xyz.amorgan.blurhash'] is String
             ? event.infoMap['xyz.amorgan.blurhash']

lib/widgets/mxc_image.dart

@@ -150,7 +150,7 @@ class _MxcImageState extends State<MxcImage> {
   Widget placeholder(BuildContext context) =>
       widget.placeholder?.call(context) ??
       const Center(
-        child: CircularProgressIndicator.adaptive(),
+        child: CircularProgressIndicator.adaptive(strokeWidth: 2),
       );
 
   @override