fix(tensorrt_yolox): yolox extra bbox with zero value

[manato]

Description

In the current code, the yolox node with yolox-tiny model outputs extra bounding boxes with zero values.
For example, if the model detects 3 objects, the node outputs will be 6 bounding boxes and half of them contain
(x, y, w, h, score) = (0, 0, 0, 0, 0).

This PR fixes the above-unintended behavior.

Tests performed

ros2 launch tensorrt_yolox yolox_tiny.launch.xml

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.09 ⚠️

Comparison is base (084c7e2) 15.29% compared to head (9159617) 15.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4089      +/-   ##
==========================================
- Coverage   15.29%   15.21%   -0.09%     
==========================================
  Files        1461     1466       +5     
  Lines      101218   101763     +545     
  Branches    31216    31168      -48     
==========================================
- Hits        15484    15479       -5     
- Misses      68899    69464     +565     
+ Partials    16835    16820      -15     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	15.30% <ø> (+<0.01%)	⬆️	Carriedforward from c5ff69e

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

Impacted Files	Coverage Δ
perception/tensorrt_yolox/src/tensorrt_yolox.cpp	0.00% <0.00%> (ø)
...avior_path_planner/marker_util/debug_utilities.hpp	0.00% <ø> (ø)
...th_planner/scene_module/lane_change/base_class.hpp	17.07% <ø> (+0.79%)	⬆️
...nner/utils/lane_change/lane_change_module_data.hpp	50.00% <ø> (ø)
...or_path_planner/src/behavior_path_planner_node.cpp	18.64% <ø> (+0.27%)	⬆️
...path_planner/src/marker_util/lane_change/debug.cpp	0.00% <ø> (ø)
...th_planner/src/scene_module/lane_change/normal.cpp	4.87% <ø> (+0.04%)	⬆️
...avior_path_planner/src/utils/lane_change/utils.cpp	0.40% <ø> (+<0.01%)	⬆️
...g/behavior_path_planner/src/utils/safety_check.cpp	31.57% <ø> (+3.45%)	⬆️
...g/behavior_path_planner/test/test_safety_check.cpp	43.24% <ø> (-1.63%)	⬇️

... and 8 files with indirect coverage changes

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[yukkysaito]

LGTM

[miursh]

Looks work fine

[wep21]

LGTM