vimhelp: Strip \x01ACTION…\x01 off msg

This allows one to do "/me checks ;help bar" and have the message be
properly interpreted.  Previously, the \x01 would be part of the help
topic.

Signed-off-by: James McCoy <vega.james@gmail.com>
Merge pull request #1 from jamessan/master

vimhelp: Strip \x01ACTION…\x01 off msg