fix(behavior_path_planner): reset modified goal id

[kosuke55]

Description

Fix the problem that modified goal is not published when receiving new route before modifying the goal

Related links

Tests performed

psim

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[purewater0901]

LGTM

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.26 ⚠️

Comparison is base (0d4e444) 11.86% compared to head (a6df517) 11.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3095      +/-   ##
==========================================
- Coverage   11.86%   11.61%   -0.26%     
==========================================
  Files        1333     1333              
  Lines       92786    94827    +2041     
  Branches    24649    26134    +1485     
==========================================
+ Hits        11011    11015       +4     
- Misses      70364    72237    +1873     
- Partials    11411    11575     +164     

Flag	Coverage Δ		*Carryforward flag
differential	5.55% <ø> (?)
total	11.86% <ø> (ø)		Carriedforward from 0d4e444

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

Impacted Files	Coverage Δ
...er/src/scene_module/pull_over/pull_over_module.cpp	0.00% <ø> (ø)

... and 8 files with indirect coverage changes

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