fix issue when a student visits a manually unlocked quiz with one time results

fixes CNVS-15869

test plan
  - as a teacher
    - create a quiz
      - with a lock date in the past
      - give a time limit
      - allow multiple attempts
      - let students see their quiz responses
        - only after their last attempt
        - only once after each attempt

    - moderate the quiz
      - manually unlock the quiz for a student

  - as a student
    - attempt to take the manually unlocked quiz
    - you should be able to take it

Change-Id: Idd0ee39f818439ad12f4da5436f2bd02fd4a36b9
Reviewed-on: https://gerrit.instructure.com/41882
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Trevor deHaan <tdehaan@instructure.com>
Reviewed-by: Ahmad Amireh <ahmad@instructure.com>
Product-Review: Ahmad Amireh <ahmad@instructure.com>