fix(behavior_path_planner): fix lane change path inside check

[rej55]

Description

Before this change, the lane change path is often out of preferred lane because it checks lane change terminal point only.
To fix it, I changed from checking the terminal point to checking the start point.

Related links

Tests performed

Tested in planning simulator

TIER IV INTERNAL TEST

Notes for reviewers

Interface changes

Nothing.

Effects on system behavior

Lane change path will start from non-preferred lane

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (0795882) 14.20% compared to head (7a10244) 14.20%.

❗ Current head 7a10244 differs from pull request most recent head 7df165b. Consider uploading reports for the commit 7df165b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4215      +/-   ##
==========================================
- Coverage   14.20%   14.20%   -0.01%     
==========================================
  Files        1597     1597              
  Lines      109806   109816      +10     
  Branches    31487    31494       +7     
==========================================
  Hits        15603    15603              
- Misses      77256    77266      +10     
  Partials    16947    16947              

Flag	Coverage Δ		*Carryforward flag
differential	13.67% <0.00%> (?)
total	14.20% <ø> (+<0.01%)	⬆️	Carriedforward from 0795882

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

Impacted Files	Coverage Δ
...th_planner/src/scene_module/lane_change/normal.cpp	5.49% <0.00%> (-0.02%)	⬇️
...avior_path_planner/src/utils/lane_change/utils.cpp	0.39% <0.00%> (-0.01%)	⬇️

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