fix issue where clicking 'back' from preview doesn't redirect to ember properly
fix issue where clicking 'back' from preview doesn't redirect to ember properly

fixes CNVS-13592

test plan:
  - enable draft state and quiz stats
  - as a teacher
    - create a quiz
    - preview the quiz
    - when you complete the preview it will show you preview results
    - hit the back button
    - it should redirect you back to the ember quiz overview tab for the quiz

Change-Id: I363f0dc8793e402f32b186702f30b91b721d12e8
Reviewed-on: https://gerrit.instructure.com/36386
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Caleb Guanzon <54fa1f30d451e4f3c341a8f3c47c9215fd0be9c6@instructure.com>
Reviewed-by: Jason Madsen <bcb5fff571a20f07c35d17ba9c364855c776dce7@instructure.com>
Product-Review: Derek DeVries <ff87a0776152510efd53bb1f4ea089dbbc90e730@instructure.com>

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