Fixes ADMIN-311
Test Plan:
* Create an assignment that has an override
assigned to two students
* Conclude one of the users
* Go back to the assignment page and notice it
now only lists '1 Student'
* Go to the edit page and notice only the active
user is listed for the override
Change-Id: I2f351afa4cf341bab1e3679d47cc032c8f729207
Reviewed-on: https://gerrit.instructure.com/131961
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
QA-Review: Deepeeca Soundarrajan <dsoundarrajan@instructure.com>
Product-Review: Dan Minkevitch <dan@instructure.com>
Dan Minkevitch