chore: Remove custom errorwidgetbuilder

We should rather switch to sentry at one point instead of
annoying users with error popups
all the time.

lib/main.dart

@@ -8,7 +8,6 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/utils/client_manager.dart';
 import 'package:fluffychat/utils/platform_infos.dart';
-import 'package:fluffychat/widgets/error_widget.dart';
 import 'config/setting_keys.dart';
 import 'utils/background_push.dart';
 import 'widgets/fluffy_chat_app.dart';
@@ -72,7 +71,6 @@ Future<void> startGui(List<Client> clients, SharedPreferences store) async {
   await firstClient?.roomsLoading;
   await firstClient?.accountDataLoading;
 
-  ErrorWidget.builder = (details) => FluffyChatErrorWidget(details);
   runApp(FluffyChatApp(clients: clients, pincode: pin, store: store));
 }