after taking the quiz, change ember take quiz button to say 'take quiz again'

fixes CNVS-13256

test plan
  - enable fabulous quizzes
  - as a teacher
    - create a quiz that allows multiple attempts
    - publish the quiz
    - visit the ember quiz page
    - the dropdown menu should say 'take the quiz'
    - begin taking the quiz, but don't submit it
    - revisit the ember quiz page
    - the dropdown menu should now say 'resume quiz'
    - resume the quiz
    - revisit the ember quiz page
    - the dropdown menu should now say 'take the quiz again'

  - as a student
    - visit the ember quiz page
    - the button should say 'take the quiz'
    - begin taking the quiz, but don't submit it
    - revisit the ember quiz page
    - the button should now say 'resume quiz'
    - resume the quiz
    - revisit the ember quiz page
    - the button should now say 'take the quiz again'

Change-Id: I6c53887ad0898681459d7162831157b4065ce7c3
Reviewed-on: https://gerrit.instructure.com/35530
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Josh Simpson <jsimpson@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>