chore(repo): add missed trailing commas

packages/stream_chat_flutter_core/example/lib/main.dart

@@ -88,7 +88,7 @@ class HomeScreen extends StatelessWidget {
                 [
                   StreamChatCore.of(context).currentUser!.id,
                 ],
-              )
+              ),
             ]),
             emptyBuilder: (BuildContext context) => const Center(
               child: Text('Looks like you are not in any channels'),

packages/stream_chat_persistence/example/lib/main.dart

@@ -245,7 +245,7 @@ class _MessageViewState extends State<MessageView> {
                 ),
               ],
             ),
-          )
+          ),
         ],
       );
 }