fix(tracking_object_merger): fix unintended error in radar tracking merger

[YoshiRi]

Description

After evaluation in xx1 project in TIER IV, #5269 has several unintended error.

This PR fixes apparent error fixed in xx1 project

Tests performed

Tested in tier4/pilot.auto.xx1 project. : tier4#952

Not applicable.

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (738c376) 14.77% compared to head (209bdf7) 14.74%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5328      +/-   ##
==========================================
- Coverage   14.77%   14.74%   -0.03%     
==========================================
  Files        1664     1664              
  Lines      115084   115004      -80     
  Branches    35498    35476      -22     
==========================================
- Hits        17007    16963      -44     
+ Misses      78892    78866      -26     
+ Partials    19185    19175      -10     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	14.74% <ø> (-0.03%)	⬇️	Carriedforward from 738c376

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

Files	Coverage Δ
...ehavior_path_planner/src/utils/avoidance/utils.cpp	11.61% <ø> (+0.06%)	⬆️
...rivable_area_expansion/drivable_area_expansion.cpp	44.82% <ø> (+0.45%)	⬆️
.../imu_corrector/src/gyro_bias_estimation_module.cpp	100.00% <ø> (+10.71%)	⬆️
.../imu_corrector/src/gyro_bias_estimation_module.hpp	0.00% <ø> (ø)
sensing/imu_corrector/src/gyro_bias_estimator.cpp	0.00% <ø> (ø)
...orrector/test/test_gyro_bias_estimation_module.cpp	100.00% <ø> (+22.72%)	⬆️

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[yukkysaito]

LGTM