FW Position Control: remove duplicated position_sp_triplet update

Signed-off-by: Silvan Fuhrer <silvan@auterion.com>

src/modules/fw_pos_control_l1/FixedwingPositionControl.cpp

@@ -1683,7 +1683,6 @@ FixedwingPositionControl::Run()
 		}
 
 		manual_control_setpoint_poll();
-		_pos_sp_triplet_sub.update(&_pos_sp_triplet);
 		vehicle_attitude_poll();
 		vehicle_command_poll();
 		vehicle_control_mode_poll();