fix(autoware_lidar_centerpoint): fix clang-diagnostic-unused-private-field (#9471)

Signed-off-by: kobayu858 <yutaro.kobayashi@tier4.jp>

Author: kobayu858

perception/autoware_lidar_centerpoint/include/autoware/lidar_centerpoint/node.hpp

@@ -51,7 +51,6 @@ class LidarCenterPointNode : public rclcpp::Node
   rclcpp::Subscription<sensor_msgs::msg::PointCloud2>::SharedPtr pointcloud_sub_;
   rclcpp::Publisher<autoware_perception_msgs::msg::DetectedObjects>::SharedPtr objects_pub_;
 
-  float score_threshold_{0.0};
   std::vector<std::string> class_names_;
   bool has_variance_{false};
   bool has_twist_{false};