fix(intersection_module): remove decel parameter (#370)

Signed-off-by: 1222-takeshi <m.takeshi1995@gmail.com>

planning_launch/config/scenario_planning/lane_driving/behavior_planning/behavior_velocity_planner/intersection.param.yaml

@@ -2,7 +2,6 @@
   ros__parameters:
     intersection:
       state_transit_margin_time: 0.5
-      decel_velocity: 8.33 # 8.33m/s = 30.0km/h
       stop_line_margin: 3.0
       stuck_vehicle_detect_dist: 3.0 # this should be the length between cars when they are stopped. The actual stuck vehicle detection length will be this value + vehicle_length.
       stuck_vehicle_ignore_dist: 7.0 # obstacle stop max distance(5.0m) + stuck vehicle size / 2 (0.0m-)