fix(autoware_behavior_path_goal_planner_module): fix lateral_offset related warnings (#7624)

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

Author: veqcc

planning/behavior_path_planner/autoware_behavior_path_goal_planner_module/src/goal_searcher.cpp

@@ -161,9 +161,7 @@ GoalCandidates GoalSearcher::search(
     original_search_poses.push_back(original_search_pose);  // for createAreaPolygon
     Pose search_pose{};
     // search goal_pose in lateral direction
-    double lateral_offset = 0.0;
     for (double dy = 0; dy <= max_lateral_offset; dy += lateral_offset_interval) {
-      lateral_offset = dy;
       search_pose = calcOffsetPose(original_search_pose, 0, sign * dy, 0);
 
       const auto transformed_vehicle_footprint =
@@ -185,7 +183,7 @@ GoalCandidates GoalSearcher::search(
 
       GoalCandidate goal_candidate{};
       goal_candidate.goal_pose = search_pose;
-      goal_candidate.lateral_offset = lateral_offset;
+      goal_candidate.lateral_offset = dy;
       goal_candidate.id = goal_id;
       goal_id++;
       // use longitudinal_distance as distance_from_original_goal