fix displayManager deprecation

modules/nixos/desktop/xorg/default.nix

@@ -9,9 +9,8 @@
     ./i18n.nix
   ];
 
-  config = {
+  config = lib.mkIf config.desktop.enable {
-    services.xserver = lib.mkIf config.desktop.enable {
+    services = {
-      enable = true;
       displayManager = {
         sddm.enable = true;
         autoLogin = {
@@ -20,24 +19,27 @@
         };
         defaultSession = "none+awesome";
       };
-      windowManager.awesome = {
+      xserver = {
         enable = true;
-        luaModules = with pkgs.luaPackages; [
+        windowManager.awesome = {
-          luarocks
+          enable = true;
-          vicious
+          luaModules = with pkgs.luaPackages; [
-        ];
+            luarocks
-      };
+            vicious
-      libinput = {
+          ];
-        enable = true;
-
-        # disabling mouse acceleration
-        mouse = {
-          accelProfile = "flat";
         };
+        libinput = {
+          enable = true;
 
-        # disabling touchpad acceleration
+          # disabling mouse acceleration
-        touchpad = {
+          mouse = {
-          accelProfile = "flat";
+            accelProfile = "flat";
+          };
+
+          # disabling touchpad acceleration
+          touchpad = {
+            accelProfile = "flat";
+          };
         };
       };
     };