wgengine: reduce critical section

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No need to hold wgLock while using the device to LookupPeer;
that has its own mutex already.

Updates #cleanup

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: Ib56049fcc7163cf5a2c2e7e12916f07b4f9d67cb

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