Install the meta package as part of one add_package install call.

live-build/auto/config

@@ -422,11 +422,11 @@ case $PROJECT in
 
 	ubuntu-touch|ubuntu-pd)
 		if [ "$PROJECT" = "ubuntu-touch" ]; then
-			add_package install ubuntu-touch
+			meta_package=ubuntu-touch
 		else
-			add_package install ubuntu-pocket-desktop
+			meta_package=ubuntu-pocket-desktop
 		fi
-		add_package install ubuntu-minimal systemd-sysv- packagekit ubuntu-system-settings-online-accounts
+		add_package install ubuntu-minimal $meta_package systemd-sysv- packagekit ubuntu-system-settings-online-accounts
 
 		COMPONENTS='main restricted universe'
 		BOOTAPPEND_LIVE='hostname=ubuntu-phablet username=ubuntu'