Revert "switch otd for xppen driver"

This reverts commit ebc8893f4c.

configuration.nix

@@ -40,7 +40,6 @@
   };
   services.xserver.enable = true;
   services.displayManager.gdm.enable = true;
-  programs.xppen.enable = true;
   programs.dconf.profiles.gdm.databases = [
     {
       settings."org/gnome/desktop/interface".scaling-factor = lib.gvariant.mkUint32 1;
@@ -84,6 +83,10 @@
 
   # Enable touchpad support (enabled default in most desktopManager).
   services.libinput.enable = true;
+  hardware.opentabletdriver = {
+    enable = true;
+    daemon.enable = true;
+  };
 
   # Define a user account. Don't forget to set a password with ‘passwd’.
   fonts.packages = with pkgs; [