StageAPI bosses only drop one penny as Tainted Keeper

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/41408b74-2ae6-4abf-950a-a1019100f2a0" />

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/315611a4-c866-493c-b169-f4e646db2db6" />

Normally, bosses drop several coins when defeated as Tainted Keeper, but StageAPI bosses do not.