MJCF to SDF: Set wordlbody geom as static model

[ahcorde]

Signed-off-by: ahcorde ahcorde@gmail.com

🦟 Bug fix

Summary

MJCF to SDF: Set wordlbody geom as static model

Checklist

• [x] Signed all commits for DCO
• [x] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [x] codecheck passed (See contributing)
• [x] All tests passed (See test coverage)
• [x] 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[bot]]

Codecov Report

Merging #51 (94e781f) into main (6537aaa) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   97.53%   97.55%   +0.02%     
==========================================
  Files          16       16              
  Lines         568      573       +5     
==========================================
+ Hits          554      559       +5     
  Misses         14       14              

Impacted Files	Coverage Δ
...f_to_sdformat/mjcf_to_sdformat/converters/world.py	96.15% <100.00%> (+0.91%)	:arrow_up:

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