Hide quiz answers when term is concluded

Hide quiz answers for courses with concluded term and restrict_quiz_questions is true

Fixes CNVS-13075

Test Plan
 - At the account level, check the option to restrict students from
 viewing quiz questions after course end date.
 - Set a term to end in the near future.
 - Set a course to this term. (NOTE: Do not set course end date within
 the course)
 - Log into this course as the student and take at least one quiz.
 - As the student, go to the completed quiz after the course has
 concluded naturally by term end date passing.
 - You should not see the quiz questions or answers

Change-Id: Ib06c0e2ab94b297ec0d50f0af5af9697bf2ee132
Reviewed-on: https://gerrit.instructure.com/39351
Reviewed-by: Derek DeVries <ddevries@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Brian Finney <bfinney@instructure.com>