Group Leave action is broken on Groups Dashboard and Homepage
Summary
Changes made in https://gitlab.com/gitlab-org/gitlab-ce/commit/97f08c651e0c95e33dee4a529ff80472e7d3bbe4 in app/assets/javascripts/groups/components/app.vue
file as a part of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16813 caused a regression where clicking on Leave action for a any group on Group Dashboard or Homepage doesn't show modal for leave confirmation or even perform Leave action.
Proposal
Reverting back prop name from updateModal
to showModal
fixes the problem.