FlightTasks: do not adjust tilt limit of the position control

Adjusting the tilt limit can lead to diverging position control
and should only be used by setting a sanity limit for the controller
and not to adjust during the descent phase of a Land or RTL.
Otherwise it leads to flyaways in important failsafe modes when
there's stronger disturbance e.g. wind.

src/modules/mc_pos_control/PositionControl/PositionControl.hpp

@@ -109,7 +109,7 @@ public:
 
 	/**
 	 * Set the maximum tilt angle in radians the output attitude is allowed to have
-	 * @param tilt angle from level orientation in radians
+	 * @param tilt angle in radians from level orientation
 	 */
 	void setTiltLimit(const float tilt) { _lim_tilt = tilt; }