message: mission: fix yawing at non-fly-through waypoints
  This fixes the issue where the drone would always turn to face North on
  each non-fly-through waypoint. It makes more sense to to just continue
  like normal.
diff: @@ -101,7 +101,8 @@ float MissionItemImpl::get_mavlink_param3() const
  float MissionItemImpl::get_mavlink_param4() const
  {
  - float yaw_angle_deg = 0.0f;
  + // Just let the drone fly forward.
  + float yaw_angle_deg = NAN;
  return yaw_angle_deg;
  }
  