use quiz namespace for module requirements

closes CNVS-12052

test plan:
  - do test plan with and without draft-state
    - create two modules, add pre-req in second for the first
    - add quiz to second module
    - do with and without a hard refresh
    - click second module gear icon and choose edit
      - click 'add requirement'
      - verify that you can add the quiz as a requirement
  - repeat using all possible quiz types

Change-Id: If44a1538427db22bde2da57514d52f834c2c62cd
Reviewed-on: https://gerrit.instructure.com/32966
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Derek DeVries <ddevries@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Jason Madsen <jmadsen@instructure.com>