fix issue where hitting the back button while taking a quiz stops backing up answers
fix issue where hitting the back button while taking a quiz stops backing up answers

fixes CNVS-9607

test plan:
- create a quiz with a 1 minute time limit and 10 questions
- take the quiz and half way through hit the back button
- choose to stay on the page
- continue to answer questions
- close the window without submitting
- resume the quiz
- all questions you initially answered should have answers saved

Change-Id: Idd7a6bdf83423ce5286768e2019d1cd0d2f044ae
Reviewed-on: https://gerrit.instructure.com/26493
Reviewed-by: Stanley Stuart <2b43fb8b7a234825d50dd49ce7892d78a59da8f3@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Caleb Guanzon <54fa1f30d451e4f3c341a8f3c47c9215fd0be9c6@instructure.com>
Product-Review: Derek DeVries <ff87a0776152510efd53bb1f4ea089dbbc90e730@instructure.com>

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