fix #1810 Screen reader reading previously focused autocomplete field…

… on tab

This fixes an issue with JAWS, which reads the previously focused autocomplete
field when pressing tab while the suggestions list is opened.
The problem seems to come from the aria-activedescendant attribute being
removed too quickly (before the next field is focused).

PTR 14068536

src/aria/widgets/form/AutoComplete.js

@@ -285,7 +285,6 @@ module.exports = Aria.classDefinition({
         _afterDropdownClose : function () {
             if (this._cfg.waiAria) {
                 var field = this.getTextInputField();
-                field.removeAttribute("aria-activedescendant");
                 field.removeAttribute("aria-owns");
 
                 var dropDownIcon = this._getDropdownIcon();