graphite-gtk-theme: fix wallpapers

`wallpaper/Graphite-normal` directory had been moved to `wallpaper/Graphite` in
upstream vinceliuice/Graphite-gtk-theme@d1c8ec940964582f934feaff1346e73084ab4ddd.

+1 -1
+1 -1
pkgs/data/themes/graphite-gtk-theme/default.nix
··· 63 64 ${lib.optionalString wallpapers '' 65 mkdir -p $out/share/backgrounds 66 - cp -a wallpaper/Graphite-normal/*.png $out/share/backgrounds/ 67 ${lib.optionalString (builtins.elem "nord" tweaks) '' 68 cp -a wallpaper/Graphite-nord/*.png $out/share/backgrounds/ 69 ''}
··· 63 64 ${lib.optionalString wallpapers '' 65 mkdir -p $out/share/backgrounds 66 + cp -a wallpaper/Graphite/*.png $out/share/backgrounds/ 67 ${lib.optionalString (builtins.elem "nord" tweaks) '' 68 cp -a wallpaper/Graphite-nord/*.png $out/share/backgrounds/ 69 ''}