Fix cancelling of board settings modal

Inactive Accountrequested to merge
winh-fix-board-modal-cancel into master

What does this MR do?

Fix board settings modal after @toggle was renamed to @cancel in the modal component by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16189.

Does this MR meet the acceptance criteria?

  • Tests added for this feature/bug
  • Review
    • Has been reviewed by Frontend

What are the relevant issue numbers?

fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/4565

Edited by Inactive Account

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