ipn/ipnstate, wgengine: make PeerStatusLite.LastHandshake zero Time means none

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... rather than 1970. Code was using IsZero against the 1970 team
(which isn't a zero value), but fortunately not anywhere that seems to
have mattered.

Updates #cleanup

Change-Id: I708a3f2a9398aaaedc9503678b4a8a311e0e019e
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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