Shortens new labcoat sprites

So I like nienhaus' new labcoat sprites a lot and they're definintely improvements over the old labcoats as seen here:

![ss 2014-10-07 at 07 59 02](https://cloud.githubusercontent.com/assets/7247232/4553320/33361b46-4e97-11e4-8d5b-304421558272.png)
![ss 2014-10-07 at 07 58 54](https://cloud.githubusercontent.com/assets/7247232/4553321/3415affe-4e97-11e4-87a8-c66514d6fc44.png)

However some people have issues with the length so I shortened them a few pixels to knee-height
![ss 2014-10-07 at 08 00 43](https://cloud.githubusercontent.com/assets/7247232/4553326/5013f9fe-4e97-11e4-9654-21c64cbd2eb9.png)