st/mesa: set drawpixels swizzle before creating sampler view
(some) drivers need to have the swizzle set prior to create_sampler_view being called in order to actually apply it
Fixes: d11fefa9 ("st/mesa: optimize 4-component ubyte glDrawPixels")
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(some) drivers need to have the swizzle set prior to create_sampler_view being called in order to actually apply it
Fixes: d11fefa9 ("st/mesa: optimize 4-component ubyte glDrawPixels")