iox-#2532 Fix whitespace in literal operation declaration warning

[elBoberido]

Notes for Reviewer

See title

Pre-Review Checklist for the PR Author

1. Code follows the coding style of CONTRIBUTING.md
2. [~] Tests follow the best practice for testing
3. Changelog updated in the unreleased section including API breaking changes
4. Branch follows the naming format (iox-123-this-is-a-branch)
5. Commits messages are according to this guideline
   • Commit messages have the issue ID (iox-#123 commit text)
   • Commit author matches Eclipse Contributor Agreement (and ECA is signed)
6. Update the PR title
   • Follow the same conventions as for commit messages
   • Link to the relevant issue
7. Relevant issues are linked
8. Add sensible notes for the reviewer
9. All checks have passed (except task-list-completed)
10. Assign PR to reviewer

Checklist for the PR Reviewer

• Consider a second reviewer for complex new features or larger refactorings
• Commits are properly organized and messages are according to the guideline
• Code according to our coding style and naming conventions
• Unit tests have been written for new behavior
• Public API changes are documented via doxygen
• Copyright owner are updated in the changed files
• All touched (C/C++) source code files from iceoryx_hoofs have been added to ./clang-tidy-diff-scans.txt
• PR title describes the changes

Post-review Checklist for the PR Author

1. All open points are addressed and tracked via issues

References

• Closes Nightly build on macOS fails due to whitespace in literal operator declaration #2532

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.87%. Comparing base (161586f) to head (6b159af).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2533      +/-   ##
==========================================
+ Coverage   77.86%   77.87%   +0.01%     
==========================================
  Files         446      446              
  Lines       16301    16301              
  Branches     2320     2320              
==========================================
+ Hits        12693    12695       +2     
  Misses       2759     2759              
+ Partials      849      847       -2     

Flag	Coverage Δ
unittests	77.70% <100.00%> (+0.01%)	⬆️
unittests_timing	15.00% <66.66%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
iceoryx_hoofs/time/include/iox/detail/duration.inl	93.82% <100.00%> (ø)

... and 1 file with indirect coverage changes

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