Don't set a desktop base seed for ubuntu-base or ubuntu-core.

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (2.784) UNRELEASED; urgency=medium
+
+  * Don't set a desktop base seed for ubuntu-base or ubuntu-core.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Sun, 25 Sep 2022 01:40:22 -0700
+
 livecd-rootfs (2.783) kinetic; urgency=medium
 
   [ Alexandre Ghiti ]

live-build/auto/config

@@ -1034,6 +1034,8 @@ case $PROJECT:${SUBPROJECT:-} in
 	ubuntu-server:live)
 		BASE_SEED='server'
 		;;
+	ubuntu-base:*|ubuntu-core:*)
+		;;
 	*)
 		BASE_SEED='desktop'
 		;;