No duplicate golden pickups
如果在有金钥匙的情况下掉落了金钥匙则转换为金炸弹，金炸弹同理
如果两个都有则转换为金金币（如果你玩的是里该隐那么就不会转换）
If a golden key is spawned when you already have a golden key, it will be converted into a golden bomb.
The same goes for golden bombs. If you have both of them at the same time, they will be converted into golden coins
(Excluding Tainted Cain)
