Change the dither texture's swizzling

This is a more elegant way to sample from a float alpha texture.
Instead of sampling from the red channel in the fragment shader
we can set the alpha channel swizzle to redirect it to the
red channel. This lets us sample from the alpha channel in the
fragment shader and get the correct value.

Change-Id: I95bbf7a82964e1bf42c0fee1b782b6bdbbcef618