Use correct params for DO_MOUNT_CONTROL
Use correct params for DO_MOUNT_CONTROL

If MAV_MOUNT_MODE is GPS_POINT, the mavlink documentation recommends to
use params4-6. In the current implementation params1-3 were used
instead.

PX4/Firmware,PX4/Firmware,acfloria/Firmware,krbeverx/Firmware,PX4/Firmware,PX4/Firmware,PX4/Firmware,PX4/Firmware,krbeverx/Firmware,acfloria/Firmware,krbeverx/Firmware,acfloria/Firmware,krbeverx/Firmware,krbeverx/Firmware,krbeverx/Firmware,acfloria/Firmware,PX4/Firmware,acfloria/Firmware,acfloria/Firmware,acfloria/Firmware,krbeverx/Firmware