chore(core): fix example

packages/stream_chat_flutter_core/example/lib/main.dart

@@ -4,7 +4,7 @@ import 'package:stream_chat_flutter_core/stream_chat_flutter_core.dart';
 Future<void> main() async {
   /// Create a new instance of [StreamChatClient] passing the apikey obtained
   /// from your project dashboard.
-  final client = StreamChatClient('b67pax5b2wdq', logLevel: Level.INFO);
+  final client = StreamChatClient('b67pax5b2wdq');
 
   /// Set the current user. In a production scenario, this should be done using
   /// a backend to generate a user token using our server SDK.