addDNSSetupForAll makes us the peer's main DNS forwarder, and the catch-all NRPT
rule is the other half of that same job: without it the adapter's NameServer only
adds one more resolver to the set Windows queries in parallel. Having the two in
one place says that, where a separate block at the end of applyDNSConfig read as
an afterthought.
The block could not simply move up: removeDNSMatchPolicies deletes the catch-all
key too, so installing the rule before it ran would have had the rule deleted
moments later. The cleanup now runs first, which is what it was always for - it
clears what the previous apply installed before this one installs anything - and
keeps being unconditional, so a leftover rule from an earlier run cannot survive
into a config that no longer wants it.
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