wgengine: replace Engine.SetNetworkMap with SetSelfNode

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The engine only used the netmap to look up self addresses and the
self node's primary routes, so pass it the self node directly
rather than the whole netmap.

Updates #12542

Change-Id: I13c0028eed65d2177baf4cf6c449f5e441845a18
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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