nixos/bind: Fix cacheNetworks option

services.bind.cacheNetworks should only apply to recursive queryies, as
per the option documentation:
> Note that this is for recursive queries – all networks are allowed to
> query zones configured with the zones option by default [...].

This would correspond to the `allow-query-cache` option in named.conf,
as per the BIND docs[1]:
> Specifies which hosts (an IP address list) can access this server’s
> cache and thus effectively controls recursion.

And not `allow-query`, which restricts all requests (including requests
where the server has authority) [2]:
> Specifies which hosts (an IP address list) are allowed to send queries
> to this resolver.
> [...]
> Note:
> `allow-query-cache` is used to specify access to the cache.

[1]: https://bind9.readthedocs.io/en/v9.20.0/reference.html#namedconf-statement-allow-query-cache
[2]: https://bind9.readthedocs.io/en/v9.20.0/reference.html#namedconf-statement-allow-query

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