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lightbox: Fix banding issues with the vignette shader

Jonas Dreßler requested to merge verdre/gnome-shell:better-vignette into main

Just as mutter!352 (merged) did for the MetaBackgroundActor in mutter, let's fix the vignette shader in gnome-shell, too.

Based on a patch originally propsed by Nikita Churaev, see !59 (closed).

Fixes: #3942 (closed)

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