remove enrollments_visible_to
remove enrollments_visible_to

refs #CNVS-23729

Change-Id: I0b8b6fb61533d0a61d9a302a5beaa3918b317d63
Reviewed-on: https://gerrit.instructure.com/66362
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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