Closing VNC windows yields warning on controller logs

[ruimarinho]

Once orchard vnc vm <id> open a new screensharing window and that window is closed - as opposed to Ctrl^C on the command itself, the orchard controller logs an (innocuous) warning:

controller-0 controller {"level":"warn","ts":1687962689.750116,"caller":"controller/api_vms_portforward.go:100","msg":"failed to port-forward: write tcp 10.10.10.10:443->10.10.10.91:56550: write: broken pipe"}