nixos-module.nix: remove remnant

nixos-module.nix

@@ -1,6 +1,6 @@
 { pkgs, config, lib, ... }:
 
-with import ./. { pkgs = import ../../programs/nixpkgs {}; };
+with import ./. { inherit pkgs; };
 
 let
   inherit (pkgs.lib) mkOption types;