fix displayManager deprecation

modules/nixos/desktop/xorg/default.nix

@@ -9,9 +9,8 @@
     ./i18n.nix
   ];
 
-  config = {
-    services.xserver = lib.mkIf config.desktop.enable {
-      enable = true;
+  config = lib.mkIf config.desktop.enable {
+    services = {
       displayManager = {
         sddm.enable = true;
         autoLogin = {
@@ -20,6 +19,8 @@
         };
         defaultSession = "none+awesome";
       };
+      xserver = {
+        enable = true;
         windowManager.awesome = {
           enable = true;
           luaModules = with pkgs.luaPackages; [
@@ -42,4 +43,5 @@
         };
       };
     };
+  };
 }