reenable canvas id setting - allows admin login to be redirected to canvas

Now that we have sync options including in the LMS class and the production->staging database scripts this is fine to reenable, which will make login behavior match production too.
I don't think we want to blindly do this.  For admin@beyondz.org, college-lms@beyondz.org, and coaches-lms@beyondz.org, we want them to be Canvas users.  However, for the test users, like student-sjsu-2b@beyondz.org, we want to be able to test various things like accepting and importing them into Canvas.  Once we have the "refresh staging from production" process in place, we can always test the actual experience using real users that have already been accepted into canvas.  But we always want a handful of test accounts that mimic a user who has signed up adn applied but hasn't been accepted yet.