budgie-gsettings-override: move from budgie scope to top-level

nixos/modules/services/x11/desktop-managers/budgie.nix

@@ -8,7 +8,7 @@ let
   nixos-background-light = pkgs.nixos-artwork.wallpapers.nineish;
   nixos-background-dark = pkgs.nixos-artwork.wallpapers.nineish-dark-gray;
 
-  nixos-gsettings-overrides = pkgs.budgie.budgie-gsettings-overrides.override {
+  nixos-gsettings-overrides = pkgs.budgie-gsettings-overrides.override {
     inherit (cfg) extraGSettingsOverrides extraGSettingsOverridePackages;
     inherit nixos-background-dark nixos-background-light;
   };

pkgs/desktops/budgie/default.nix

@@ -6,7 +6,6 @@ lib.makeScope newScope (
     inherit (self) callPackage;
   in
   {
-    budgie-gsettings-overrides = callPackage ./budgie-gsettings-overrides { };
     budgie-screensaver = callPackage ./budgie-screensaver { };
     budgie-session = callPackage ./budgie-session { };
     magpie = callPackage ./magpie { };