feat(ionic): allow customize <ion-item> lines (#1809)
feat(ionic): allow customize <ion-item> lines (#1809)

fix #1732
formly-js/ng2-formly,ngx-formly/ngx-formly,ngx-formly/ngx-formly,formly-js/ng-formly,formly-js/ng2-formly,formly-js/ng-formly,ngx-formly/ngx-formly,formly-js/ng2-formly,ngx-formly/ngx-formly