[openstreetmap/openstreetmap-website] Embedded maps are broken for Thunderforest layers (#1293)

[Ronald]

@tomhughes Embedded maps are (again?) not working for me.

```html
<iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="http://www.openstreetmap.org/export/embed.html?bbox=13.27938884496689%2C52.47697613861493%2C13.282763063907625%2C52.478498702364185&layer=mapnik&marker=52.47773742707537%2C13.281075954437256" style="border: 1px solid black"></iframe><br/><small><a href="http://www.openstreetmap.org/?mlat=52.47774&mlon=13.28108#map=19/52.47774/13.28108">Größere Karte anzeigen</a></small>
```

shows nothing but a gray box. Has anything changed?

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