Fix rare case where 7TV emotes don't show

7TV emotes are locked to 4x size, but if that doesn't exist an exception
is thrown. The lack of 4x size seems to
be caused by a new emote still in processing.

lib/models/emotes.dart

@@ -261,9 +261,10 @@ class Emote {
     final emoteData = emote.data;
 
     final url = emoteData!.host.url;
+
     // Flutter doesn't support AVIF yet.
-    final file = emoteData.host.files.reversed.firstWhere(
-      (file) => file.format != 'AVIF' && file.name.contains('4x'),
+    final file = emoteData.host.files.lastWhere(
+      (file) => file.format != 'AVIF',
     );
 
     // Check if the flag has 1 at the 8th bit.