Fix uv rotation code for the 90 degree and 270 degree cases.
Fix uv rotation code for the 90 degree and 270 degree cases.

Was causing bugs when border radii were clipped.

servo/webrender,servo/webrender,servo/webrender,servo/webrender,alanamramjit/webrender,alanamramjit/webrender,servo/webrender,servo/webrender