Set placeholder in notifications manager for wiring in RP settings providers

lib/services/notifications_manager.dart

@@ -273,7 +273,8 @@ class NotificationsManager extends ChangeNotifier {
 
   Future<void> _processNewNotifications(
       Iterable<UserNotification> notifications) async {
-    final groupNotifications = getIt<SettingsService>().notificationGrouping;
+    // TODO get grouping information from Riverpod service
+    // final groupNotifications = getIt<SettingsService>().notificationGrouping;
     final dmsMap = <String, UserNotification>{};
     final crMap = <String, UserNotification>{};
     final unreadMap = <String, UserNotification>{};