fix for UI glitch with HSVCUBE color picker, color was noticeably not very smooth or aligned.
- HSV values need to be shifted.
- drawing the quads wasnt aligned well to colors.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60937 954f8c5b-7b00-dc11-b283-0030488c597c