Green Quiz Icon

Fixes: CNVS-16220

Notes:
- Updated selector to include quiz icon

Test Plan
- Publish the quiz
- Navigate to the quiz index page (courses/:id/quizzes)
- Observe the 'Q' icon next to the quiz title is grey, but should be green.

Change-Id: I5203d1ce335e4faa54743befb69fbd4aa9f6ec84
Reviewed-on: https://gerrit.instructure.com/43553
Reviewed-by: Derek DeVries <ddevries@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Colleen Palmer <colleen@instructure.com>
QA-Review: Trevor deHaan <tdehaan@instructure.com>