fix correct/incorrect arrows in ember for legacy submissions

fixes CNVS-13488

test plan:
  - enable draft state and quiz stats
  - as a teacher
    - create a quiz that allows multiple attempts

  - as a student
    - take the quiz, and get the results correct
    - when the quiz results are displayed it should show the correct arrow on
      results
    - take the quiz, and get results incorrect
    - when the quiz results are displayed it should show the incorrect arrow on
      the results

  - as a teacher
    - preview the quiz
    - you should get preview results with correct/incorrect arrows working

  - other things to try
    - try navigating to a quiz from the index page
    - try refreshing the page when on the overview tab
    - try switching between overview/statistics tabs
    - the arrows should display correctly all cases

Change-Id: Ib8bed0f0b6e54c1ccadac8a4d5fd9450e2069e22
Reviewed-on: https://gerrit.instructure.com/36101
Reviewed-by: Jason Madsen <jmadsen@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Nathan Rogowski <nathan@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>