Attachments lead to infinite money

[jameskyvo]

Describe the bug
If you try to sell an attachment that is attached to one of your weapons at a ferry, you will be given the money as if you have sold it, but it will remain in your inventory, giving you infinite wealth.

To Reproduce
Steps to reproduce the behavior:

1. Equip attachment on active weapon
2. Try to sell
3. ???
4. Profit

Expected behavior
The attachment should either not appear in the sell menu or should be removed when sold