Prevent kb shortcuts dialog from appearing in LMGB
Prevent kb shortcuts dialog from appearing in LMGB

closes OUT-3948

flag=none

Learning Mastery Gradebook has no keyboard shortcuts,
so the dialog isn't necessary.

test plan:
  - open learning mastery gradebook
  - confirm that pressing <shift + ?> does not bring
    up a keyboard shortcuts dialog, like it would
    in regular gradebook

Change-Id: Iac8b474abbee67f52d43eb19c89281c07f48efa3
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/247238
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Michael Brewer-Davis <785693f4c81267e5b88c0f98d39b56a39a2b6910@instructure.com>
Reviewed-by: Pat Renner <792d9ff02286b7420e6cc0794587e33424e05663@instructure.com>
QA-Review: Brian Watson <4411c2aac809443ec63e2dd517de0f2dbc7408c6@instructure.com>
Product-Review: Jody Sailor

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