1) Change the WC_defaulthost port of the appserver instance from 9080 to 80
2) Make sure "80" is listed as a "Host alias" for the "default_host" virtual host or another virtual host you have created exclusively for LiveCycle
3) Re-start the appserver instance
4) Check the SystemOut.log and verify that all LiveCycle web modules now bind to port 80, among others (like 5060, 5061 etc).
5) Try http://localhost/workspace and it should work.
Can your instruction above work for the wc_defaulthost_secure that has SSL e.g. https://localhost/workspace ? I tried but it does not work without the port. Can you please advise.