fix(start_plannere): do not request when modifed route is received

[kosuke55]

Description

Fix the issue that when the ego vehicle is stopped and the modified route is received request start planner again
In this PR check not modified route start pose but original route start pose for start planner execution request.

Related links

#4453

Tests performed

psim

tier4 internal sceanrio simulator

Notes for reviewers

Interface changes

none

Effects on system behavior

none

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[codecov]

Codecov Report

Patch coverage: 50.00% and no project coverage change.

Comparison is base (4811435) 14.85% compared to head (566d6e3) 14.85%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4528   +/-   ##
=======================================
  Coverage   14.85%   14.85%           
=======================================
  Files        1521     1521           
  Lines      105224   105228    +4     
  Branches    32018    32019    +1     
=======================================
+ Hits        15627    15629    +2     
- Misses      72525    72527    +2     
  Partials    17072    17072           

Flag	Coverage Δ		*Carryforward flag
differential	15.85% <50.00%> (?)
total	14.85% <ø> (ø)		Carriedforward from 4811435

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

Files Changed	Coverage Δ
planning/route_handler/src/route_handler.cpp	24.94% <50.00%> (+0.11%)	⬆️

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