net/dns, ipn/ipnlocal: fix regressions from change moving away from deephash #17499
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I got sidetracked apparently and never finished writing this Clone
code in 316afe7 (#17448). (It really should use views instead.)
And then I missed one of the users of "routerChanged" that was broken up
into "routerChanged" vs "dnsChanged".
This broke integration tests elsewhere.
Fixes #17506