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

[Tom Hughes]

To explain further, this is the bit of VCL that chooses the upstream:

```
# Snippet Choose Backend : 100
if ( client.geo.continent_code == "OC" ) {
  set req.backend = australia;
} else if ( client.geo.continent_code == "NA" ||
            client.geo.continent_code == "SA" ) {
  set req.backend = america;
} else {
  set req.backend = europe;
}

  # default conditions
  set req.backend = F_Odin___Amsterdam;
    # end default conditions
```

The first bit is my custom VCL which replaces your previous condition based attempt with a version that does better fallback.

But that that choice is overwritten by some fastly generated VCL that I can't work out how to get rid of.


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