Ensure `super` call is bounded
Ensure `super` call is bounded

This bit me in a recent 2.12 upgrade, so I'm making sure other addons have the call right
ember-a11y/ember-a11y-testing,ember-a11y/ember-a11y-testing,ember-a11y/ember-a11y-testing,trentmwillis/ember-a11y-testing,trentmwillis/ember-a11y-testing