docker: arrow_flight_sql.uri isn't configured

[kou]

arrow-flight-sql-postgresql/package/docker/apache-arrow-flight-sql-enable.sh

Lines 46 to 52 in 5556ba7

	if [ "${ssl}" = "on" ]; then
	uri="grpc+tls://0.0.0.0:15432"
	else
	uri="grpc://0.0.0.0:15432"
	fi
	echo "arrow_flight_sql.uri = '${url}'" | \
	tee -a "${PGDATA}/postgresql.conf"

has a typo. url -> uri