Fix reference to window object in choropleth code

[w4]

No description provided.

[w4]

If this is affecting anyone else (ie. anyone using CommonJS and the dataUrl config prop), the easiest fix is a monkeypatch.

import * as Datamap from 'datamaps';

...

const originalDraw = Datamap.prototype.draw;
const originalUpdateChoropleth = Datamap.prototype.updateChoropleth;

Datamap.prototype.draw = function () {
    window['Datamaps'] = Datamap;
    originalDraw.call(this);
};

Datamap.prototype.updateChoropleth = function (data, options) {
    delete window['Datamaps'];
    originalUpdateChoropleth.call(this, data, options);
}