fix(trajectory_follower): change default param for curvature smoothing

[TakaHoribe]

Related Issue(required)

None.

Description(required)

The value 1 for this parameter causes a noisy steering command. Set default back to 15 as in the previous version.

Note that for the vehicle driving a narrow road with high tracking precision, please keep using 1 value.

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[codecov]

Codecov Report

Merging #498 (ea7822b) into main (9114b66) will increase coverage by 24.39%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #498       +/-   ##
===========================================
+ Coverage   10.95%   35.34%   +24.39%     
===========================================
  Files         704        7      -697     
  Lines       49671     1372    -48299     
  Branches     6655      850     -5805     
===========================================
- Hits         5440      485     -4955     
+ Misses      39869      161    -39708     
+ Partials     4362      726     -3636     

Impacted Files	Coverage Δ
..._departure_checker_node/lane_departure_checker.cpp
...pure_pursuit/include/pure_pursuit/pure_pursuit.hpp
...nning/behavior_path_planner/src/path_utilities.cpp
...lude/lanelet2_extension/io/autoware_osm_parser.hpp
...er4_state_rviz_plugin/src/autoware_state_panel.cpp
...mon/autoware_auto_common/test/test_angle_utils.cpp
planning/motion_velocity_smoother/src/resample.cpp
...ude/scene_module/virtual_traffic_light/manager.hpp
...onitor/include/localization_error_monitor/node.hpp
...ulator/vehicle_model/sim_model_ideal_steer_vel.hpp
... and 687 more

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[tkimura4]

LGTM