Jonas Dreßler 81f62e9df8 lightbox: Fix banding issues with the vignette shader
Just as https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/352
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
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/59.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3942
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2133>
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