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 = {
@@ -20,24 +19,27 @@
         };
         defaultSession = "none+awesome";
       };
-      windowManager.awesome = {
+      xserver = {
         enable = true;
-        luaModules = with pkgs.luaPackages; [
-          luarocks
-          vicious
-        ];
-      };
-      libinput = {
-        enable = true;
-
-        # disabling mouse acceleration
-        mouse = {
-          accelProfile = "flat";
+        windowManager.awesome = {
+          enable = true;
+          luaModules = with pkgs.luaPackages; [
+            luarocks
+            vicious
+          ];
         };
+        libinput = {
+          enable = true;
 
-        # disabling touchpad acceleration
-        touchpad = {
-          accelProfile = "flat";
+          # disabling mouse acceleration
+          mouse = {
+            accelProfile = "flat";
+          };
+
+          # disabling touchpad acceleration
+          touchpad = {
+            accelProfile = "flat";
+          };
         };
       };
     };