ipn/ipnlocal: remove UnlockEarly from doSetHostinfoFilterServices

Pull the lock-bearing code into a closure, and use a clone rather than a
shallow copy of the hostinfo record.

Updates #11649

Change-Id: I4f1d42c42ce45e493b204baae0d50b1cbf82b102
Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>
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