Update px4-rc.gzsim - fix wrong check_scene_info() return

[drfenixion]

Swaped up check_scene_info() return result.

	if check_scene_info; then
		echo "INFO  [init] Gazebo world is ready"
		break
	fi

Therefore should return 1 in case of correct check.

[dakejahl]

that's not correct, 0 return means success