spec fix spec in course api

test plan
 - specs should pass

Change-Id: I153178b26697206a44aa56648f9c570615fcef00
Reviewed-on: https://gerrit.instructure.com/31798
Reviewed-by: Nick Cloward <ncloward@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Rob Orton <rob@instructure.com>
QA-Review: Rob Orton <rob@instructure.com>