Force exit to menu on quick play disonnection (#35793)

Author: imvanni

osu.Game/Screens/OnlinePlay/Matchmaking/Match/ScreenMatchmaking.cs

@@ -192,6 +192,7 @@ private void onRoomUpdated()
             if (this.IsCurrentScreen() && client.Room == null)
             {
                 Logger.Log($"{this} exiting due to loss of room or connection");
+                exitConfirmed = true;
                 this.Exit();
             }
         }