fix(goal_planner): fix occpancy grid initializing check

[kosuke55]

Description

fix occpancy grid initializing check

Tests performed

psim with use_occupancy_grid: false

2023/09/12 https://evaluation.tier4.jp/evaluation/reports/79b3b226-04aa-573d-9761-420ec895925f/?project_id=prd_jt

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Patch coverage: 5.55% and project coverage change: -0.01% ⚠️

Comparison is base (bcf52e0) 15.82% compared to head (6c2eda7) 15.82%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4969      +/-   ##
==========================================
- Coverage   15.82%   15.82%   -0.01%     
==========================================
  Files        1580     1580              
  Lines      109212   109241      +29     
  Branches    33673    33688      +15     
==========================================
+ Hits        17286    17287       +1     
- Misses      73312    73338      +26     
- Partials    18614    18616       +2     

Flag	Coverage Δ		*Carryforward flag
differential	17.79% <5.55%> (?)
total	15.82% <ø> (-0.01%)	⬇️	Carriedforward from bcf52e0

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

Files Changed	Coverage Δ
.../scene_module/goal_planner/goal_planner_module.hpp	13.33% <ø> (ø)
.../scene_module/goal_planner/goal_planner_module.cpp	8.53% <0.00%> (-0.29%)	⬇️
...cene_module/start_planner/start_planner_module.cpp	30.20% <33.33%> (+0.01%)	⬆️
planning/behavior_path_planner/src/utils/utils.cpp	18.48% <100.00%> (ø)

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