fix issue resaving a quiz after updating a question without saving

caused by a regression from updating routes for rails 4

fixes CNVS-16474

test plan:
  - as a teacher
    - create a quiz with a question
    - publish the quiz
    - update a question on the quiz, but don't save the quiz itself
    - refresh the page
    - you should get a notice that 'you have made changes to questions...'
    - click the 'save it now' button
    - it should save successfully

Change-Id: Id1a8ea918d5d968c63e883c8ee145222ab55a0b9
Reviewed-on: https://gerrit.instructure.com/43560
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Ahmad Amireh <ahmad@instructure.com>
QA-Review: Trevor deHaan <tdehaan@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>