FlightTask: if not in air, reActivate the task which will set the setpoints to current

vehicle state.

src/modules/mc_pos_control/mc_pos_control_main.cpp

@@ -692,6 +692,8 @@ MulticopterPositionControl::run()
 				setpoint.yawspeed = NAN;
 				setpoint.yaw = _states.yaw;
 				constraints.landing_gear = vehicle_constraints_s::GEAR_KEEP;
+				// reactivate the task which will reset the setpoint to current state
+				_flight_tasks.reActivate();
 			}
 
 			// limit altitude only if local position is valid