xdg-desktop-portal-gtk: stop depending on gnome-settings-daemon at runtime

On my Plasma 6 desktop this removed those dependencies:
colord: 1.4.6 → ∅, -3742.9 KiB
gcr: 4.3.1 → ∅, -2077.1 KiB
geocode-glib: 3.26.4 → ∅, -218.7 KiB
gnome-session-ctl: 47.0.1 → ∅, -37.6 KiB
gnome-settings-daemon: 47.2 → 47.2-gsettings, -6814.5 KiB
libgnomekbd: 3.28.1 → ∅, -689.5 KiB
libgweather: 4.4.4 → ∅, -23408.9 KiB
libxklavier: 5.4 → ∅, -158.8 KiB

pkgs/by-name/xd/xdg-desktop-portal-gtk/package.nix

@@ -12,6 +12,7 @@
   glib,
   wrapGAppsHook3,
   gsettings-desktop-schemas,
+  runCommand,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -38,7 +39,11 @@ stdenv.mkDerivation (finalAttrs: {
     xdg-desktop-portal
     gsettings-desktop-schemas # settings exposed by settings portal
     gnome-desktop
-    gnome-settings-daemon # schemas needed for settings api (mostly useless now that fonts were moved to g-d-s, just mouse and xsettings)
+    # schemas needed for settings api (mostly useless now that fonts were moved to g-d-s, just mouse and xsettings)
+    (runCommand "gnome-settings-daemon-${gnome-settings-daemon.version}-gsettings-schemas" { } ''
+      mkdir -p $out/share
+      cp -r ${gnome-settings-daemon}/share/gsettings-schemas/ $out/share/
+    '')
   ];
 
   meta = with lib; {