spec: fix self_enrollment enabling

Change-Id: I073511735ba6afb71b4bf3aef28e19e467885e51
Reviewed-on: https://gerrit.instructure.com/39876
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>