remove xterm

modules/desktops/gnome-desktop.nix

@@ -1,8 +1,11 @@
-{...}: {
+{pkgs, ...}: {
   services.xserver = {
     # Enable the X11 windowing system (needed even for Wayland sessions)
     enable = true;
 
+    # Exclude xterm from the list of packages to install
+    excludePackages = [pkgs.xterm];
+
     # Enable the GNOME Desktop Environment.
     displayManager.gdm.enable = true;
     desktopManager.gnome.enable = true;