fix(drivable_area_expansion): disable by default (#639)

Signed-off-by: Maxime CLEMENT <maxime.clement@tier4.jp>

autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/drivable_area_expansion.param.yaml

@@ -7,7 +7,7 @@
 
     # Dynamic expansion by using the path curvature
     dynamic_expansion:
-      enabled: true
+      enabled: false
       print_runtime: false
       max_expansion_distance: 0.0 # [m] maximum distance by which the drivable area can be expended (0.0 means no limit)
       smoothing: