Fix "nuxeo-group-deleted" event to contain the name of the deleted group

    <nuxeo-resource id="editRequest" path="group/[[groupname]]" response="{{group}}"
      headers='{"fetch.group": "memberUsers,memberGroups"}'></nuxeo-resource> 

_deleteGroup() {
          this.$.deleteGroupDialog.toggle();
          this.$.editRequest.data = this.group;
          this.$.editRequest.remove().then(() => {
            this.dispatchEvent(new CustomEvent('nuxeo-group-deleted', {
              composed: true,
              bubbles: true,
              detail: this.group,
            }));
            this._goHome();
          });
        }