Fix SdfGenerator unit test

[iche033]

Signed-off-by: Ian Chen ichen@osrfoundation.org

🦟 Bug fix

Fixes #1852

Summary

The backpack model was updated in December. I believe that's when the test started failing. This is fixed in main branch

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 #1853 (e45e009) into gz-sim7 (90eb788) will increase coverage by 0.46%.
The diff coverage is 83.53%.

❗ Current head e45e009 differs from pull request most recent head 3a600e6. Consider uploading reports for the commit 3a600e6 to get more accurate results

@@             Coverage Diff             @@
##           gz-sim7    #1853      +/-   ##
===========================================
+ Coverage    64.19%   64.66%   +0.46%     
===========================================
  Files          336      342       +6     
  Lines        26916    27350     +434     
===========================================
+ Hits         17278    17685     +407     
- Misses        9638     9665      +27     

Impacted Files	Coverage Δ
include/gz/sim/SystemLoader.hh	100.00% <ø> (ø)
include/gz/sim/Util.hh	100.00% <ø> (ø)
include/gz/sim/components/DetachableJoint.hh	100.00% <ø> (ø)
...nclude/gz/sim/components/ExternalWorldWrenchCmd.hh	100.00% <ø> (ø)
include/gz/sim/components/LevelBuffer.hh	100.00% <ø> (ø)
include/gz/sim/components/LevelEntityNames.hh	100.00% <ø> (ø)
include/gz/sim/components/PerformerAffinity.hh	100.00% <ø> (ø)
include/gz/sim/components/PerformerLevels.hh	100.00% <ø> (ø)
src/Barrier.cc	100.00% <ø> (ø)
src/TestFixture.cc	100.00% <ø> (ø)
... and 32 more

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