Work around jQuery bug that allows for XSS
Work around jQuery bug that allows for XSS

Fixes FOO-2219
Refs SEC-4279
Refs FOO-87
flag = none

Addresses security issue.

Test plan:
* Security is satisfied

Change-Id: I434ebf65ef51e5a0e462d241dbb1695d231ef9d1
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/270169
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Jacob Burroughs <8ecea6e385af5cf9f53123f5ca17fb5fd6a6d4b2@instructure.com>

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