fw_pos_control_l1: add takeoff minimum pitch parameter

- remove mavlink mechanism for setting minimum pitch

src/modules/fw_pos_control_l1/runway_takeoff/RunwayTakeoff.cpp

@@ -221,13 +221,12 @@ bool RunwayTakeoff::resetIntegrators()
  * the climbtout minimum pitch (parameter).
  * Otherwise use the minimum that is enforced generally (parameter).
  */
-float RunwayTakeoff::getMinPitch(float sp_min, float climbout_min, float min)
+float RunwayTakeoff::getMinPitch(float climbout_min, float min)
 {
 	if (_state < RunwayTakeoffState::FLY) {
-		return math::max(sp_min, climbout_min);
-	}
+		return climbout_min;
 
-	else {
+	} else {
 		return min;
 	}
 }

src/modules/fw_pos_control_l1/runway_takeoff/RunwayTakeoff.h

@@ -86,7 +86,7 @@ public:
 	float getYaw(float navigatorYaw);
 	float getThrottle(const hrt_abstime &now, float tecsThrottle);
 	bool resetIntegrators();
-	float getMinPitch(float sp_min, float climbout_min, float min);
+	float getMinPitch(float climbout_min, float min);
 	float getMaxPitch(float max);
 	matrix::Vector2f getStartWP();