fix: remove dead code

nixos/modules/gnome.nix

@@ -3,6 +3,7 @@
 in {
   config = mkIf config.role.gnome {
     services.xserver = {
+      enable = true;
       desktopManager.gnome.enable = true;
       displayManager.gdm.enable = true;
     };
@@ -10,6 +11,11 @@ in {
     environment.systemPackages = with pkgs.gnomeExtensions; [
       dash-to-dock
       gsconnect
+      appindicator
+    ];
+
+    services.udev.packages = with pkgs.gnome; [
+      gnome-settings-daemon
     ];
   };
 }