draw a scrollbar with BORDER_COLOR if this scrollbar is odd
Tweaking of mod selection window
Moves FANGS mouthgear check

Muzzles used to block mouthgear so there wasn't any point in checking
for it if you had a muzzle.  With the XL mouthgear, that's no longer the
case, so pulled the check into general from the no-muzzle option and
deleted the reference to MUZZLE_BEAR since that doesn't affect the
chance to bite.
Merge branch 'fangfix' of github.com:KA101/Cataclysm-DDA
Merge branch 'scrollbar' of github.com:illi-kun/Cataclysm-DDA
Merge branch 'mod_win' of github.com:illi-kun/Cataclysm-DDA