Update expected value in notify_spec

Prevent test failures when Gitlab is configured to use a port other than 80.
That made both lines shorter, although I had to break up the `have_body_text` line anyway to get it below 80 characters.  I left it this way because I thought it made sense to have a variable for the password token instead of repeating the string literal.  I can change it back to using the literals if you'd prefer that.