SAK-23600

Make it so that the system-wide help is used instead of the help action
in the portlet.

This should go into 2-9-x quickly and 2.9.3



git-svn-id: https://source.sakaiproject.org/svn/web/trunk@124573 66ffb92e-73f9-0310-93c1-f5514f145a0a