allow quiz stats feature flag to be used
allow quiz stats feature flag to be used

fixes CNVS-13612

test plan:
  - go to the feature flags page
  - quiz stats should no longer have a 'hidden' badge

Change-Id: I55bb4fa493701e2bce99ec2a8b8d586a76088ea2
Reviewed-on: https://gerrit.instructure.com/36390
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jason Madsen <bcb5fff571a20f07c35d17ba9c364855c776dce7@instructure.com>
QA-Review: Caleb Guanzon <54fa1f30d451e4f3c341a8f3c47c9215fd0be9c6@instructure.com>
Product-Review: Derek DeVries <ff87a0776152510efd53bb1f4ea089dbbc90e730@instructure.com>

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