chore(start_planner): tighten shift collision check (autowarefoundation#983)

Author: shmpwk

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

@@ -25,7 +25,7 @@
       enable_shift_pull_out: true
       check_shift_path_lane_departure: true
       allow_check_shift_path_lane_departure_override: true
-      shift_collision_check_distance_from_end: -15.0
+      shift_collision_check_distance_from_end: -13.0
       minimum_shift_pull_out_distance: 0.0
       maximum_longitudinal_deviation: 1.0 # Note, should be the same or less than planning validator's "longitudinal_distance_deviation"
       lateral_jerk: 0.5