fix bug where essay questions answers not saved
fix bug where essay questions answers not saved

closes CNVS-11603

test plan:
  - as an instructor
    - create and publish a quiz that:
      - has an essay question
      - has a time limit
      - allows students to see their submitted answers
  - as a student
    - start quiz
    - enter something via the RCE for the essay question (dont submit)
    - allow time to expire on the quiz
    - click 'Ok, fine' in the 'Times up' modal dialog that pops up
  - your answer should be displayed in the following quiz summary page

Change-Id: I0f8bc7ff177f3cd012ec8311fad631ec2f519348
Reviewed-on: https://gerrit.instructure.com/31403
Reviewed-by: Derek DeVries <ff87a0776152510efd53bb1f4ea089dbbc90e730@instructure.com>
QA-Review: Myller de Araujo <e5c7c5e1b7f2ce5e9870cc98ec52b20b3006cb48@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Product-Review: Derek DeVries <ff87a0776152510efd53bb1f4ea089dbbc90e730@instructure.com>

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