cleanups and move steamdeck to desktop module

modules/desktop/default.nix

@@ -29,7 +29,7 @@
 #    myDesktop.extraSystemPackages = with pkgs; [ some-tool ];
 #
 
-{ config, lib, pkgs, pkgs-stable, inputs, user, ... }:
+{ config, lib, pkgs, inputs, user, ... }:
 
 let
   cfg = config.myDesktop;
@@ -156,8 +156,8 @@ in
           sbctl
           ausweisapp
           e2fsprogs
-        ]
-        ++ (with pkgs-stable; [ orca-slicer ])
+          orca-slicer
+	]
         ++ cfg.extraSystemPackages;
 
       nixpkgs.config.permittedInsecurePackages = [ "mbedtls-2.28.10" ];