Loosen up feature flag to allow on beta/prod
Loosen up feature flag to allow on beta/prod

closes: CNVS-28837

Test Plan:
- As an admin, navigate to your institution's account,
  then settings and select 'Feature Options'

- Scroll down to the 'Enable Dashboard Images for
  Courses' feature

- It should only have the beta tag (it should no longer
  have the 'hidden' or 'development' tags)

- If you flip the switch to 'Allow' and then navigate
  to a course, the feature options in the course
  settings should have the option to enable the
  dashboard images

- Enabling this option at the course level should display
  an image for that course card on the dashboard if an
  image is present

- Returning to the intstitution's feature options,
  if the 'Enable Dashboard Images for Courses'
  feature is set to 'On' every course should
  automatically have the option to add a course
  image

Change-Id: I610fb3d5ac45813fb8a5f656103f0fc82357c1dd
Reviewed-on: https://gerrit.instructure.com/87562
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
Product-Review: Chris Hart <b82b40b84a2f06957ec9caf1768340bd6b929cc4@instructure.com>
QA-Review: Pierce Arner <de38b793164d9bfa12fc4185260c174139808169@instructure.com>

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