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Revert "opengl: fix swizzle"

GL_LUMINANCE_ALPHA textures should be sampled through r and a swizzle since it has a (L,L,L,A) layout.

This reverts commit 4082f4f2, but includes also the fix from c69bbb07 to avoid using an invalid swizzle.

Fixes #26767 (closed) Reintroduce #26735 (closed)

Edited by Alexandre Janniaux

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