Resolve issue given by the QA

Author: geeta07

app/code/Magento/Search/view/frontend/web/js/form-mini.js

@@ -69,9 +69,11 @@ define([
                 media: '(max-width: 768px)',
                 entry: function () {
                     this.isExpandable = true;
+                    this.element.attr('aria-expanded', false);
                 }.bind(this),
                 exit: function () {
                     this.isExpandable = true;
+                    this.element.attr('aria-expanded', false);
                 }.bind(this)
             });