remove unnecessary GroupRemoveModal warning supression
remove unnecessary GroupRemoveModal warning supression

refs LS-3571
flag=none

The test(s) previously causing this error have either been fixed or
removed. This supression is no longer necessary.

test plan:
  - tests pass

qa risk: low

Change-Id: I3aef822aa32c7228cf1a5e8cdb07979282dd64c2
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/304492
Reviewed-by: Jackson Howe <318c10a818c1b1f2ec50cdcb1827b2c6c5ebd7dc@instructure.com>
QA-Review: Davis Hyer <60fbffed049dcae9186e63e354cbc0b825bf5523@instructure.com>
Product-Review: Davis Hyer <60fbffed049dcae9186e63e354cbc0b825bf5523@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,instructure/canvas-lms