fix: element android did not reset notification counts

src/service/rooms/user/mod.rs

@@ -22,6 +22,10 @@ impl Service {
         self.db.highlight_count(user_id, room_id)
     }
 
+    pub fn last_notification_read(&self, user_id: &UserId, room_id: &RoomId) -> Result<u64> {
+        self.db.last_notification_read(user_id, room_id)
+    }
+
     pub fn associate_token_shortstatehash(
         &self,
         room_id: &RoomId,