update import statement for recommender module to use namespace import

Author: danmarshall

packages/chart-recommender/test/recommend.mjs

@@ -1,7 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 import assert from 'assert';
-import recommender from '../dist/es6/index.js';
+import * as recommender from '../dist/es6/index.js';
 import fs from 'fs';
 import * as vega from 'vega';
 import { getColumnsFromData } from '@msrvida/sanddance-specs';