nixos-mod/frontend: use nixfmt as nix formatter for vscodium

nix/nixos-modules/frontend/home.nix

@@ -331,7 +331,7 @@ in
         "nix.serverPath" = "${pkgs.nil}/bin/nil";
         "nix.serverSettings" = {
           nil = {
-            formatting.command = [ "${pkgs.nixpkgs-fmt}/bin/nixpkgs-fmt" ];
+            formatting.command = [ "${pkgs.nixfmt-rfc-style}/bin/nixfmt" ];
           };
         };