Merge pull request #48 from dzoech/fix/use-correct-notification-tag-s…

…chema

Fix backend notification service using invalid tag

src/Nudelsieb/Nudelsieb.Notifications/Notifyer/AndroidNotifyer.cs

@@ -94,6 +94,6 @@ public async Task<string> SendAsync(string message, Guid receiverId)
         /// An installation for the Notifications Hub automatically creates a tag for the defined user id.
         /// Example tag: $UserId:{93fab134-e9ed-4a73-a106-ba6fa15f7f20}
         /// </summary>
-        private string GetTagForUserId(Guid userId) => $"$UserId:{userId}";
+        private string GetTagForUserId(Guid userId) => "$UserId:{" + userId + "}";
     }
 }