fix(motion_velocity_smoother): front wheel steer rate calculation

[VRichardJP]

see #5964

Description

Tests performed

Not applicable.

Effects on system behavior

Before PR, front_wheel_angle_rad values were shifted by 1 point forward. Consequently, Autoware may now turn slightly later than before.

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[rej55]

LGTM

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e4e3b61) 15.25% compared to head (3a82e0f) 15.24%.
Report is 5 commits behind head on main.

Files	Patch %	Lines
...n_velocity_smoother/src/smoother/smoother_base.cpp	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5965      +/-   ##
==========================================
- Coverage   15.25%   15.24%   -0.01%     
==========================================
  Files        1750     1750              
  Lines      120562   120635      +73     
  Branches    36735    36787      +52     
==========================================
  Hits        18392    18392              
- Misses      81543    81615      +72     
- Partials    20627    20628       +1     

Flag	Coverage Δ		*Carryforward flag
differential	14.71% <50.00%> (?)
total	15.25% <ø> (-0.01%)	⬇️	Carriedforward from e4e3b61

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