nixos/resolved: fix regressions after interface change

With the options being only set when `services.resolved.enable` was
enabled, they were only available if the host resolver was resolved. That
broke the resolved config used when initrd networking is enabled.

A good indicator that something is wrong is if the config section of
a module configures the options itself. That means non introspectable
settings are being put in place.

Additionally DNS= and Domains= need to be space-separated lists. The
manpage does not indicate that they can be set multiple times.

I decided not to port the LLMNR enablement over, since it never gained
widespread traction and is generally being phased out in favor of mDNS.

Fixes: #480964

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