Fix issue: https://github.com/dronecore/DroneCore/issues/227
Fix issue: https://github.com/dronecore/DroneCore/issues/227

Fixes Autostart SITL error during launch of integration tests by
correcting second argument to PX4 `Tools/sitl_run.sh`.

dronecore/DroneCore,dronecore/DroneCore,dronecore/DroneCore,dronecore/DroneCore