don't show wiki sidebar for locked quizzes
don't show wiki sidebar for locked quizzes

there's some kind of styling problem that only happens with
production assets, but rather than diagnose that we
may as well just not show the sidebar since it's useless

test plan:
* sync a blueprint course with
 a quiz with locked content
* in the associated course, editing the quiz should
 not show the "insert content into the page"
 sidebar

closes #MC-291

Change-Id: I764e85246a6ffec1e536ec7b2c1df46a1a0187d3
Reviewed-on: https://gerrit.instructure.com/123853
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
QA-Review: Heath Hales <8ca81b68c7e2592ac614bd07f22fcc735ca55f93@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

sfu/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms