tstest/natlab/vmtest: fix test flake

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It's possible for multiple direct connections to be counted and
these tests are successful as long as it's more than one.

Fixes #21578

Change-Id: I979efc92a43f78d0e51d602d96e61828e6fabdff
Signed-off-by: Francois Marier <francois@tailscale.com>

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