Fixes boxer shorts encumbrance

Changes boxer shorts encumbrance from -1 to 0

Hooray.
Fixes boy shorts encumbrance

Changes boy shorts encumbrance from -1 to 0. You are so silly, negative encumbrance.

I missed this in the boxer shorts thing :|
Merge pull request #5168 from Derschlact/boxer_shorts_fix

Fixes boxer/boy shorts encumbrance