Remove unnecessary line

For details see quantopian/qgrid#154 (comment)

js/lib/index.js

@@ -1,12 +1,3 @@
-// Entry point for the notebook bundle containing custom model definitions.
-//
-// Setup notebook base URL
-//
-// Some static assets may be required by the custom widget javascript. The base
-// url for the notebook is not known at build time and is therefore computed
-// dynamically.
-__webpack_public_path__ = document.querySelector('body').getAttribute('data-base-url') + 'nbextensions/higlass-jupyter/';
-
 // Export widget models and views, and the npm package version number.
 module.exports = require('./higlass-jupyter.js');
 module.exports['version'] = require('../package.json').version;