Fix flash when closing Find Modal
Fix flash when closing Find Modal

closes OUT-4701
flag=improved_outcomes_management

Test plan:
  - With FF enabled
  - Open Find Modal, notice the original state.
  - Click on a group from the LHS and wait for the outcomes
    to load on the RHS.
  - Click on the Done button.
  - Observe that a flash of the original state is not displayed
    to the user before the modal closes completely.

Change-Id: I6318994ac5a6012e7d3df5e97041312614f17965
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/271558
Reviewed-by: Martin Yosifov <6a3824bf5c535ee1ddd50b39e2ac9b6ba130ccb0@instructure.com>
QA-Review: Martin Yosifov <6a3824bf5c535ee1ddd50b39e2ac9b6ba130ccb0@instructure.com>
Product-Review: Jody Sailor
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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