remove unnecessary declaration

Signed-off-by: Ryuta Kambe <ryuta.kambe@tier4.jp>

Author: veqcc

planning/behavior_velocity_occlusion_spot_module/src/occlusion_spot_utils.hpp

@@ -64,7 +64,6 @@ using lanelet::BasicPolygon2d;
 using lanelet::ConstLineString2d;
 using lanelet::LaneletMapPtr;
 using lanelet::geometry::fromArcCoordinates;
-using lanelet::geometry::toArcCoordinates;
 using DetectionAreaIdx = std::optional<std::pair<double, double>>;
 using BasicPolygons2d = std::vector<lanelet::BasicPolygon2d>;