feat(behavior_path_planner): fix z of extracted drivable area

[takayuki5168]

Signed-off-by: Takayuki Murooka takayuki5168@gmail.com

Description

When the object is extracted from the drivable area, its z is set wrong.

before

after

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[takayuki5168]

@purewater0901 Could you review the PR.

[codecov]

Codecov Report

Base: 11.62% // Head: 11.58% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (996818b) compared to base (ff9d064).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2856      +/-   ##
==========================================
- Coverage   11.62%   11.58%   -0.04%     
==========================================
  Files        1321     1321              
  Lines       92142    92443     +301     
  Branches    24446    24642     +196     
==========================================
  Hits        10712    10712              
- Misses      70249    70536     +287     
- Partials    11181    11195      +14     

Flag	Coverage Δ		*Carryforward flag
differential	4.67% <0.00%> (?)
total	11.62% <ø> (ø)		Carriedforward from ff9d064

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

Impacted Files	Coverage Δ
...ner/src/scene_module/avoidance/avoidance_utils.cpp	1.00% <0.00%> (-0.01%)	⬇️
planning/behavior_path_planner/src/utilities.cpp	7.65% <0.00%> (-0.34%)	⬇️
...path_planner/src/scene_module/lane_change/util.cpp	0.00% <0.00%> (ø)

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