[openstreetmap/openstreetmap-website] Roll back host override on user avatar urls (#2319)

[Tom Hughes]

The reason for the second change was to make sure the links are to `www.openstreetmap.org` even if the API call is made to `api.openstreetmap.org`.

Why is `server_url` not `test.host` in your test environment? It is in mine...

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