A small fix to the shaders

I found that the trailing semi colons in the fragment shaders caused errors like these when they were loaded:

FRAGMENT glCompileShader "" FAILED
FRAGMENT Shader "" infolog:
ERROR: 0:38: ';' : syntax error syntax error

I'm not sure why I'd be the only one to get them but I suppose it might have something to do with differences between our graphics cards and/or the drivers.