Fix duplicate notification sound on foreground

lib/core/infrastructure/notification/fcm_remote_message_providers.dart

@@ -21,8 +21,8 @@ part 'fcm_remote_message_providers.g.dart';
 /// If the application is in the foreground, the Firebase SDK will block displaying any FCM notification
 /// for android/iOS no matter what Notification Channel has been set. We can however still handle incoming notifications
 /// via the onMessage stream and display a custom local notification using flutter_local_notifications.
-/// Note: FCM can handle foreground for iOS by using `setForegroundNotificationPresentationOptions` but if you
-/// want to use custom notification instead then avoid using it (or disable alert) as done in [_setupIOSHeadsUp].
+/// Note: FCM can handle foreground for iOS by using `setForegroundNotificationPresentationOptions`
+/// but if you intend to use a custom notification, avoid using it to prevent duplicate heads-up notifications.
 ///
 /// Using custom notification display for iOS in foreground is necessary to be able to
 /// handle notification interaction using `onDidReceiveNotificationResponse` from flutter_local_notifications

lib/core/infrastructure/notification/notification_service.dart

@@ -110,13 +110,14 @@ class NotificationService {
   }
 
   /// Update the iOS foreground notification presentation options to allow heads up notifications.
-  /// Disable alert if you're using flutterLocalNotification to handle foreground notifications
-  /// instead of FCM, otherwise, you'll get duplicated heads up notification.
+  /// Avoid this if you're using flutterLocalNotification to handle foreground notifications
+  /// instead of FCM, otherwise, you'll receive duplicate heads-up notifications.
   Future<void> _setupIOSHeadsUp() async {
-    await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
+    /* await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
+      alert: true,
       sound: true,
       badge: true,
-    );
+    ); */
   }
 
   Future<AuthorizationStatus> _requestPermissions() async {