gtkgreet: move from os-specific/linux to applications/display-managers/greetd

pkgs/top-level/all-packages.nix

@@ -28166,11 +28166,11 @@ with pkgs;
   grandorgue = callPackage ../applications/audio/grandorgue { };
 
   greetd = recurseIntoAttrs {
-    gtkgreet = callPackage ../os-specific/linux/gtkgreet { };
     wlgreet = callPackage ../os-specific/linux/wlgreet { };
     tuigreet = callPackage ../os-specific/linux/tuigreet { };
     dlm = callPackage ../applications/display-managers/greetd/dlm.nix { };
     greetd = callPackage ../applications/display-managers/greetd { };
+    gtkgreet = callPackage ../applications/display-managers/greetd/gtkgreet.nix { };
   };
 
   goldendict = libsForQt5.callPackage ../applications/misc/goldendict {