wgengine/userspace: delete HandshakeDone

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It is unused, and has been since early Feb 2021 (Tailscale 1.6).
We can't get delete the DeviceOptions entirely yet;
first #1831 and #1839 need to go in, along with some wireguard-go changes.
Deleting this chunk of code now will make the later commits more clearly correct.

Pingers can now go too.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

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