cmd/natc: remove speculative tuning from natc

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These tunings reduced memory usage while the implementation was
struggling with earlier bugs, but will no longer be necessary after
those bugs are addressed.

Depends #14933
Depends #14934
Updates #9707
Updates #10408
Updates tailscale/corp#24483
Updates tailscale/corp#25169

Signed-off-by: James Tucker <james@tailscale.com>

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