Remove auto-stacking on tables for credit chips

Created by: dylanstrategie

At first I noticed that the problem was caused by the credit chip counting itself during it's for loop (when afterattack is called, it's already on the table in theory), so I looked into this

Then I realized that auto-stacking is kinda dumb. This prevents you from literally covering a table full of cash, when you can just click cash with cash to stack it. So that's another way to fix it

Furthermore, the cash.worth == src.worth line prevented you from properly stacking cash as basic testing with different amounts showed

Fixes #6293 (closed)