Don't try to migrate persistence presets if read-only persistence was enabled

config/chroot_local-includes/usr/local/sbin/live-persist

@@ -85,7 +85,7 @@ migrate_persistence_preset()
 	warning "Need to make $NEW_PRESET persistent"
 	if [ "$PERSISTENCE_READONLY" = true ]
 	then
-		warning "Persistence configuration needs to be migrated, but read only was selected; please retry in read-write mode"
+		error "Persistence configuration needs to be migrated, but read only was selected; please retry in read-write mode"
 	fi
 	echo "$NEW_PRESET	source=$NEW_PRESET_SOURCE" \
 		>> "$CONFIG" \