wined3d: Allow color key processing for surfaces with alpha channel

[Ilya Shpigor]

Hello!

This is new patch for  bug:
http://bugs.winehq.org/show_bug.cgi?id=23750

I have tested color key processing for SURFACE_OPENGL and SURFACE_GDI surfaces 
with alpha channel in Windows.The color key has been processed for both 
surface types.

I don't know how to write correct Wine test for this problem. Can anybody help 
me?
Is this Wine test realy needed?

-- 
Best regards,
Ilya Shpigor.
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