Sub: remove setting of pos-con jerk

ArduSub/control_circle.cpp

@@ -16,7 +16,6 @@ bool Sub::circle_init()
     // initialize speeds and accelerations
     pos_control.set_speed_xy(wp_nav.get_speed_xy());
     pos_control.set_accel_xy(wp_nav.get_wp_acceleration());
-    pos_control.set_jerk_xy_to_default();
     pos_control.set_speed_z(-get_pilot_speed_dn(), g.pilot_speed_up);
     pos_control.set_accel_z(g.pilot_accel_z);
 

ArduSub/control_guided.cpp

@@ -94,7 +94,6 @@ void Sub::guided_posvel_control_start()
     // set speed and acceleration from wpnav's speed and acceleration
     pos_control.set_speed_xy(wp_nav.get_speed_xy());
     pos_control.set_accel_xy(wp_nav.get_wp_acceleration());
-    pos_control.set_jerk_xy_to_default();
 
     const Vector3f& curr_pos = inertial_nav.get_position();
     const Vector3f& curr_vel = inertial_nav.get_velocity();