cmd/stdiscosrv: Unflake test (fixes #5247)
cmd/stdiscosrv: Unflake test (fixes #5247)

wweich/syncthing,rumpelsepp/syncthing,uok/syncthing,imsodin/syncthing,imsodin/syncthing,AudriusButkevicius/syncthing,uok/syncthing,xduugu/syncthing,xduugu/syncthing,AudriusButkevicius/syncthing,syncthing/syncthing,syncthing/syncthing,wweich/syncthing,rumpelsepp/syncthing,uok/syncthing,rumpelsepp/syncthing,wweich/syncthing,syncthing/syncthing,uok/syncthing,syncthing/syncthing,imsodin/syncthing,rumpelsepp/syncthing,xduugu/syncthing,syncthing/syncthing,imsodin/syncthing,syncthing/syncthing,AudriusButkevicius/syncthing,wweich/syncthing,xduugu/syncthing,AudriusButkevicius/syncthing,imsodin/syncthing