Fix wsl2 configuration

lib/wsl2/default.nix

@@ -1,4 +1,6 @@
-{ inputs, self, system, username, }:
+{ inputs, self, username }:
+{ system }:
+
 let
   pkgs = inputs.nixpkgs.legacyPackages.${system};
 
@@ -11,6 +13,8 @@ let
 in inputs.home-manager.lib.homeManagerConfiguration {
   inherit pkgs;
 
+  extraSpecialArgs = { inherit self; };
+
   modules = [{
     imports = [ shared-config ];