boards: cubepilot_cubeorange only start ADSB mavlink if console not present

- cubepilot_cubeorange_test has the console enabled (used for test rack and bench debugging)

boards/cubepilot/cubeorange/init/rc.board_mavlink

@@ -6,5 +6,8 @@
 # Start MAVLink on the USB port
 mavlink start -d /dev/ttyACM0
 
-# Start ADS-B receiver mavlink connection
-mavlink start -d /dev/ttyS4
+# Start ADS-B receiver mavlink connection if console not present
+if [ ! -e /dev/console ]
+then
+	mavlink start -d /dev/ttyS4 -b 57600 -m minimal
+fi