gtkconfig: set `color-scheme` when current color scheme changes

Fushan Wen requested to merge work/fuf/527setcolorscheme into Plasma/5.27

This makes color scheme consistent between Plasma and GNOME. That is to say, when a user logs out from Plasma and logs into GNOME, the color preference will be kept.

Closes https://invent.kde.org/plasma/kde-gtk-config/-/work_items/13609

@lucabacci

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Edited by Fushan Wen

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