fix(trajectory_follower): change default param for curvature smoothing

[TakaHoribe]

PR Type

• Bug Fix

Related Links

None.

Description

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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[tkimura4]

LGTM