bug: netsim failure on mulitpath

[Frando]

netsim now usually passes on multipath but here's a recent failure:

[INFO][intg_iroh_full__1_to_1x3__i_get_0] Error: connection lost
[INFO][intg_iroh_full__1_to_1x3__i_get_0] Caused by:
[INFO][intg_iroh_full__1_to_1x3__i_get_0]     closed by peer: last path abandoned by peer (code 0)
[INFO][intg_iroh_full__1_to_1x3__i_get_0] Command failed on iteration 2 with exit code 1

https://github.com/n0-computer/iroh/actions/runs/19596925206/job/56122770939