Updates Hair Sprites

The old sprites were simply inverted, meaning what was supposed to be the highlights showed up as shadows, and vice-versa. What I've done here is simply un-inverted it and fiddled with the levels until they were at a point that the shading variance would be visible to everyone but the blackest of black hair colors.
Updated contrast so lighter hair colors were not as severe
Merge pull request #3073 from Ikarrus/hairsprites

Updates Hair Sprites