I noticed when setting `map.style` to *'satellite-streets'* [here](https://github.com/plotly/plotly.js/blob/34568d53ef1f2276bd75acbb2328b04bc43e77d1/test/image/mocks/map_predefined-styles2.json#L151) the PNG download is not working. @birkskyum This is blocking the RC release; wondering if you could possibly help fix it?