refactor(ekf_localizer): simplify duration conversion

[IshitaTakeshi]

Description

Simplify the syntax of duration conversion using rclcpp::Duration::from_seconds

Related links

Tests performed

No tests have been performed yet

Notes for reviewers

Pre-review checklist for the PR author

The PR author must check the checkboxes below when creating the PR.

• I've confirmed the contribution guidelines.
• The PR follows the pull request guidelines.

In-review checklist for the PR reviewers

The PR reviewers must check the checkboxes below before approval.

• The PR follows the pull request guidelines.
• The PR has been properly tested.
• The PR has been reviewed by the code owners.

Post-review checklist for the PR author

The PR author must check the checkboxes below before merging.

• There are no open discussions or they are tracked via tickets.
• The PR is ready for merge.

After all checkboxes are checked, anyone who has write access can merge the PR.

[codecov]

Codecov Report

Base: 10.34% // Head: 10.33% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (0f6679b) compared to base (6a6532b).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2017      +/-   ##
==========================================
- Coverage   10.34%   10.33%   -0.01%     
==========================================
  Files        1162     1162              
  Lines       82730    82737       +7     
  Branches    19271    19277       +6     
==========================================
  Hits         8555     8555              
- Misses      64915    64917       +2     
- Partials     9260     9265       +5     

Flag	Coverage Δ		*Carryforward flag
differential	18.99% <0.00%> (?)
total	10.32% <0.00%> (ø)		Carriedforward from 6a6532b

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

Impacted Files	Coverage Δ
localization/ekf_localizer/src/ekf_localizer.cpp	0.00% <0.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[kminoda]

Does anyone know why DCO test passes in this PR although the title does not seem to be valid?
(cc. @kenji-miyake ?)

[kenji-miyake]

@kminoda The title is checked in semantic-pull-request, not DCO.
Please refer to CI checks.

[kminoda]

LGTM