fix: restore foris config from snapshots

Hotfixes https://gitlab.nic.cz/turris/turris-os-packages/-/issues/657

updater/fix/files/config-foris-restore

@@ -19,5 +19,6 @@ fi
 
 if [ ! -s "$config" ]; then
 	echo "Failed to locate latest non-empty version of /etc/config/foris in snapshots! Config is empty and wizard has to be performed again." >&2
+	create_create_notification -s error "Foris configuration has been flushed! Please make sure to set it up again by accessing router's web interface."
 	exit 1
 fi