hosts/morphius: user conf default to ghostty term

Signed-off-by: unexplrd <unexplrd@linerds.us>

hosts/morphius/users/user/home-configuration.nix

@@ -1,7 +1,10 @@
-{
+{lib, ...}: {
   imports = [
     ../../../dunamis/users/user/common.nix
     ../../../dunamis/users/user/programs.nix
     ../../../dunamis/users/user/flatpak.nix
   ];
+  systemd.user.settings.Manager.DefaultEnvironment = {
+    TERMINAL = lib.mkForce "ghostty";
+  };
 }