fix(planning_evaluator): incorrect DRAC formula

[xtk8532704]

Description

Fix the incorrect DRAC calculation formula

Related links

https://star4.slack.com/archives/CRUE57C30/p1771316606324659?thread_ts=1770295766.670899&cid=CRUE57C30

How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

Thank you for contributing to the Autoware project!

🚧 If your pull request is in progress, switch it to draft mode.

Please ensure:

• You've checked our contribution guidelines.
• Your PR follows our pull request guidelines.
• All required CI checks pass before marking the PR ready for review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 18.70%. Comparing base (435a7f1) to head (a7fcf3f).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12124      +/-   ##
==========================================
+ Coverage   18.05%   18.70%   +0.65%     
==========================================
  Files        1838     1868      +30     
  Lines      126279   127318    +1039     
  Branches    44164    46602    +2438     
==========================================
+ Hits        22796    23821    +1025     
- Misses      84517    85304     +787     
+ Partials    18966    18193     -773     

Flag	Coverage Δ		*Carryforward flag
daily	20.54% <ø> (-0.01%)	⬇️	Carriedforward from 435a7f1
daily-cuda	18.04% <ø> (-0.01%)	⬇️	Carriedforward from 435a7f1
differential	3.65% <100.00%> (?)
total-cuda	18.04% <ø> (-0.01%)	⬇️	Carriedforward from 435a7f1

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.