fix(velocity_controller): debug value for feedforward

[TakaHoribe]

Description

Feedforward acceleration term is in the FF_SCALE, which is wrong.

Tests performed

run psim

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c16ba06) 14.51% compared to head (72e9191) 14.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3782   +/-   ##
=======================================
  Coverage   14.51%   14.51%           
=======================================
  Files        1442     1442           
  Lines      101582   101582           
  Branches    30204    30204           
=======================================
  Hits        14747    14747           
  Misses      70691    70691           
  Partials    16144    16144           

Flag	Coverage Δ		*Carryforward flag
differential	42.16% <ø> (?)
total	14.51% <ø> (ø)		Carriedforward from c16ba06

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
...clude/pid_longitudinal_controller/debug_values.hpp	50.00% <ø> (ø)
...nal_controller/src/pid_longitudinal_controller.cpp	39.59% <ø> (ø)

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