added three seconds delay before terminating game when player steps down

ttrs.py

@@ -352,6 +352,8 @@ class TtrsGame(threading.Thread):
 
             evt = self.player.get_event()
             if evt == PlayerEvent.QUIT:
+                time.sleep(3)
+                if self.player.get_event() == PlayerEvent.QUIT:
                     self.running = False
                     break