Rover: mode: use oa_wp_bearing_cd

APMrover2/mode.cpp

@@ -394,7 +394,7 @@ void Mode::navigate_to_waypoint()
     desired_speed = calc_speed_nudge(desired_speed, g2.wp_nav.get_reversed());
     calc_throttle(desired_speed, true);
 
-    float desired_heading_cd = g2.wp_nav.wp_bearing_cd();
+    float desired_heading_cd = g2.wp_nav.oa_wp_bearing_cd();
     if (g2.sailboat.use_indirect_route(desired_heading_cd)) {
         // sailboats use heading controller when tacking upwind
         desired_heading_cd = g2.sailboat.calc_heading(desired_heading_cd);