navigator: remove leftover debug variable

src/modules/navigator/follow_target.cpp

@@ -240,7 +240,7 @@ void FollowTarget::on_active()
 			}
 		}
 
-//		warnx(" _step_vel x %3.6f y %3.6f cur vel %3.6f %3.6f tar vel %3.6f %3.6f dist = %3.6f (%3.6f) mode = %d con ratio = %3.6f yaw rate = %3.6f",
+//		warnx(" _step_vel x %3.6f y %3.6f cur vel %3.6f %3.6f tar vel %3.6f %3.6f dist = %3.6f (%3.6f) mode = %d yaw rate = %3.6f",
 //				(double) _step_vel(0),
 //				(double) _step_vel(1),
 //				(double) _current_vel(0),
@@ -250,7 +250,7 @@ void FollowTarget::on_active()
 //				(double) (_target_distance).length(),
 //				(double) (_target_position_offset + _target_distance).length(),
 //				_follow_target_state,
-//				(double)_avg_cos_ratio, (double) _yaw_rate);
+//				(double) _yaw_rate);
 	}
 
 	if (target_position_valid()) {