Comment 3 for bug 1361270

Branch for testing: https://git.evergreen-ils.org/?p=working/Evergreen.git;a=commitdiff;h=d95dd753ecbeefe126a0cc8b8d4cc051be8e1245

It sets the org selector on the self registration form to the current org unit request parameter value if it exists and it's a valid org unit for self-registration.

This should retain the org unit selection on refresh or error instead of resetting back to the default context.