Add code quotes to TestFixture.hh

[nkoenig]

Signed-off-by: Nate Koenig [email protected]

🦟 Bug fix

Summary

The code style quotes were missing.

Checklist

• Signed all commits for DCO
• Added tests
• 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

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1723 (ad81fc2) into gz-sim7 (0df8e9e) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           gz-sim7    #1723      +/-   ##
===========================================
- Coverage    63.93%   63.91%   -0.03%     
===========================================
  Files          334      334              
  Lines        26333    26333              
===========================================
- Hits         16836    16830       -6     
- Misses        9497     9503       +6     

Impacted Files	Coverage Δ
src/SimulationRunner.cc	91.32% <0.00%> (-0.95%)	⬇️

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