Revert "feat(FormlyField): allow setting className for field which contains fieldGroup (#392)" (#405)
Revert "feat(FormlyField): allow setting className for field which contains fieldGroup (#392)" (#405)

This reverts commit 6a3cd8edbe7c2301209caba3dc465f10fe608dd7.
ngx-formly/ngx-formly,formly-js/ng-formly,ngx-formly/ngx-formly,formly-js/ng-formly,ngx-formly/ngx-formly,formly-js/ng2-formly,formly-js/ng2-formly,formly-js/ng2-formly,ngx-formly/ngx-formly