Hide Enable new SIS integration settings in prod
Hide Enable new SIS integration settings in prod

Fixes: SIS-2838

Test plan:
- Load the Canvas app in the production environment locally
- Confirm you cannot see the Enable new SIS integration feature
  flag on the account settings page under the Feature Options tab

Change-Id: If9e9482129af95c1c413ab7b0ffba41e48f0b6aa
Reviewed-on: https://gerrit.instructure.com/109365
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
Tested-by: Jenkins
QA-Review: Mark McDermott <20dd8ba615f2257ea7254f93d6f30ae11aa4f904@instructure.com>
Product-Review: Brad Humphrey <9233b6f5388d6867a2a7be14d8b4ba53c86cfde2@instructure.com>

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