net/dns: use the correct separator for multiple servers in the same NRPT rule on Windows

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If an NRPT rule lists more than one server, those servers should be separated by a semicolon (";"),
rather than a semicolon followed by a space ("; "). Otherwise, Windows fails to parse the created
registry value, and DNS resolution may fail.

https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-gpnrpt/06088ca3-4cf1-48fa-8837-ca8d853ee1e8

Fixes #19040
Updates #15404 (enabled MagicDNS IPv6 by default, adding a second server and triggering the issue)

Signed-off-by: Nick Khyl <nickk@tailscale.com>

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