remove {abc} tile server prefix

Those prefixes mainly exist to help browsers with their per-domain
connection limit [1]:

> Subdomains are used to help with browser parallel requests per domain
limitation

For us, we don't care about that limit, because we do not implement it
(server side at least). It's even better to not have those domains, as
otherwise our new connection limitation will get confused.

We might think about adding them back if the tile proxy is disabled,
but for now they seem to serve no purpose for us.

[1]: https://wiki.openstreetmap.org/wiki/Raster_tile_providers

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