feat(planning_launch): tune obstacle avoidance (autowarefoundation#156)…

… (autowarefoundation#169)

Signed-off-by: Takayuki Murooka <takayuki5168@gmail.com>

Co-authored-by: Takayuki Murooka <takayuki5168@gmail.com>

planning_launch/config/scenario_planning/lane_driving/motion_planning/obstacle_avoidance_planner/obstacle_avoidance_planner.param.yaml

@@ -147,6 +147,6 @@
               radius_ratio: 0.8
 
             rear_drive:
-              num_for_calculation: 3
+              num_for_calculation: 4
               front_radius_ratio: 1.0
               rear_radius_ratio: 1.0