fix broken courses api spec

Test plan
- Run the specs

Change-Id: I34b3f90cdac5e77509fcb27e8a4c7c989c99e2df
Reviewed-on: https://gerrit.instructure.com/44110
Reviewed-by: Spencer Olson <solson@instructure.com>
QA-Review: Josh Simpson <jsimpson@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Josh Simpson <jsimpson@instructure.com>