update cookie policy banner

common/static/js/src/CookiePolicyBanner.jsx

 import React from 'react';
 import CookieBanner from '@edx/cookie-policy-banner';
 
-const CookiePolicyBanner = () => <CookieBanner />;
-
-export default CookiePolicyBanner;
+export function CookiePolicyBanner() { return <CookieBanner />; };