quiz submissions: use cached due date
quiz submissions: use cached due date

Test Plan:
- specs pass

Change-Id: Ia5a1ce109473f0b6e8389d296e293f5764b9e66e
Reviewed-on: https://gerrit.instructure.com/161876
Reviewed-by: Gary Mei <4dff5ebcff9ed76793b70b9470ac64791a16ed11@instructure.com>
Reviewed-by: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>
Tested-by: Jenkins
Product-Review: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>
QA-Review: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>

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