Andrew Dunham 58ad21b252 wgengine/netstack: fix data race in tests
This uses the helper function added in #6173 to avoid flakes like:
    https://github.com/tailscale/tailscale/actions/runs/3826912237/jobs/6511078024

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: If3f1d3b9c0f64ffcb4ba9a30d3522ec49484f993
2023-01-19 10:17:34 -05:00
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