fix fragile quiz spec

fixes CNVS-15047
This commit fixes a spec that became fragile as a result of ef939ea.

Test plan
- Run the specs

Change-Id: Iac07e01ba1bfe6db0eb7e2028040a48e4b920ce1
Reviewed-on: https://gerrit.instructure.com/39836
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Josh Simpson <jsimpson@instructure.com>