Don't hard-code addition of xterm package on xubuntu, it's in the task already.

debian/changelog

@@ -3,6 +3,8 @@ livecd-rootfs (23.10.33) UNRELEASED; urgency=medium
   * Drop references to kubuntu-plasma5, obsolete since wily
   * ubuntucinnamon-live task has existed for a while now, use it instead of
     hard-coded list of packages.
+  * Don't hard-code addition of xterm package on xubuntu, it's in the task
+    already.
 
  -- Steve Langasek <steve.langasek@ubuntu.com>  Wed, 06 Sep 2023 11:23:17 -0700
 

live-build/auto/config

@@ -818,7 +818,6 @@ case $PROJECT in
 				add_task install minimal standard xubuntu-desktop
 				;;
 		esac
-		add_package install xterm
 		LIVE_TASK='xubuntu-live'
 		case $ARCH in
 			amd64)	KERNEL_FLAVOURS=generic ;;