Fix unresponsive button on collaborations page
Fix unresponsive button on collaborations page

fixes VICE-2428
flag=none

Test Plan:
 - see repro steps on linked ticket
  - should not be able to repro
 - go to /courses/<course_id>/collaborations
 - click the "add collaboration" button
 - if button is responsive refreshpage
 - repeat 15 times
 - if button is unresponsive leave a QA-1 and a comment

Change-Id: Ia834d6dd5371c38d0ee6bd6d9fb422c12f94d763
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/284877
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Omar Soto-Fortuño <2ca100155bc0669318a7e6f3850629c7667465e1@instructure.com>
Product-Review: Omar Soto-Fortuño <2ca100155bc0669318a7e6f3850629c7667465e1@instructure.com>
QA-Review: Jeffrey Johnson <7a0f98bfe168bc29d5611ba0275e88567b492abc@instructure.com>

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