gallium: Fix VAAPI postproc blit

Fixes the VAAPI postproc issue mentioned in this comment
(mesa/mesa!6736 (comment 626808))
without changing the height of the underlying resource when doing the
blit.

This commit removes the 0.5 pixel center offset from the compute blit - VAAPI postproc is the only function that uses this compute blit.

Fixes: 49465bab ("frontends/va/postproc: Use the actual image height when blitting")
Signed-off-by: Thong Thai <thong.thai@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <mesa/mesa!7970>
95 jobs for fix_blit_properly in 27 seconds (queued for 5 seconds)
latest
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