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vulkan: perform sRGB-to-linear conversion correctly for premultiplied values

John Lindgren requested to merge jlindgren90/wlroots:vulkan-srgb-premult-0.17 into 0.17

Pre-multipled sRGB values need to be un-multiplied before conversion to linear and then re-multiplied after. Compare shaders/texture.frag.

This fixes an issue in labwc where titlebar corners (rendered as ARGB textures) did not match the rest of the titlebar (rendered as a solid wlr_scene_rect).

Backport of !4635 (merged) to the 0.17 branch.

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