ipn/ipnlocal: use "nb" consistently as receiver for nodeBackend

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Cleanup after #15866. It was using a mix of "b" and "c" before. But "b"
is ambiguous with LocalBackend's usual "b".

Updates #12614

Change-Id: I8c2e84597555ec3db0d783a00ac1c12549ce6706
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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