fix: invalid frontend-platform import in Footer.jsx (#398)

src/components/Footer.jsx

@@ -2,7 +2,7 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import { injectIntl, intlShape } from '@edx/frontend-platform/i18n';
 import { sendTrackEvent } from '@edx/frontend-platform/analytics';
-import { ensureConfig } from '@edx/frontend-platform/config';
+import { ensureConfig } from '@edx/frontend-platform';
 import { AppContext } from '@edx/frontend-platform/react';
 
 import messages from './Footer.messages';