[BACKPORT] Fix faulty assumption in INTEGRATION_log_system (#1426)

[Blast545]

Signed-off-by: Michael Carroll michael@openrobotics.org

🦟 Bug fix

Summary

Backports #1426 to Citadel, should fix this test regression:
https://build.osrfoundation.org/job/ignition_gazebo-ci-ign-gazebo3-focal-amd64/19/testReport/(root)/LogSystemTest/LogDefaults/

Checklist

• Signed all commits for DCO
• Added tests -> Not added, but fixed (some of) them
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (ign-gazebo3@5bb179f). Click here to learn what that means.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             ign-gazebo3    #1531   +/-   ##
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  Coverage               ?   77.76%           
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  Files                  ?      250           
  Lines                  ?    14443           
  Branches               ?        0           
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  Hits                   ?    11231           
  Misses                 ?     3212           
  Partials               ?        0           

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[Blast545]

All tests passed + approval, merging.