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

[Tom Hughes]

I went with https://github.com/openstreetmap/openstreetmap-website/commit/685561687022262a1af5fc09c5617757d8529f3c instead of this, so that we can change the URL for the production site without hard coding it here.

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