MAGETWO-87126: In checkout->multishipping-> new addres clean region when select country without dropdown for states #13339

 - Merge Pull Request magento/magento2#13339 from enriquei4/magento2:FIX-REGION-NEW-ADDRESS
 - Merged commits:
   1. c84783e
   2. e2b1399
   3. 45b7e25

Author: miguelbalparda

app/code/Magento/Checkout/view/frontend/web/js/region-updater.js

@@ -195,6 +195,8 @@ define([
                 regionInput.hide();
                 label.attr('for', regionList.attr('id'));
             } else {
+                this._removeSelectOptions(regionList);
+
                 if (this.options.isRegionRequired) {
                     regionInput.addClass('required-entry').removeAttr('disabled');
                     requiredLabel.addClass('required');