[openstreetmap/openstreetmap-website] Update embed.js.erb to use CDN test URLs (#2714)

[mmd]

I haven’t seen any discussion on Fastly‘s privacy policy nor any update to our own privacy policy. Does the following still apply to Fastly? Is everyone happy with this?

> Map tiles are provided by a global network of cache servers, which tile server your browser or app access is determined dynamically by geolocation of the IP address and selection of the cache server "nearest" to you.

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