fix(ui-form-field): fix Select's focus selecting its leaf not instead of the input field

This is a fix for the bug introduced by the FormFieldLayout refactor PR 1863. Now the multiple
select example should not delete the added Tag-s

Author: matyasf

packages/ui-form-field/src/FormField/index.tsx

@@ -68,6 +68,7 @@ class FormField extends Component<FormFieldProps> {
         label={this.props.label}
         vAlign={this.props.vAlign}
         as="label"
+        htmlFor={this.props.id}
         elementRef={this.handleRef}
         margin={this.props.margin}
       />