Fix Capsule mesh generation

[azeey]

🦟 Bug fix

Fixes gazebosim/gz-sim#1769

Summary

In #186 Capsule was updated to be z-up, however when merging forward the ign-gz changes, the logic was accidentally reverted.

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 #475 (b8e5b12) into ign-common4 (ade3fa2) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           ign-common4     #475   +/-   ##
============================================
  Coverage        78.92%   78.92%           
============================================
  Files               75       75           
  Lines             9556     9556           
============================================
  Hits              7542     7542           
  Misses            2014     2014           

Impacted Files	Coverage Δ
graphics/src/MeshManager.cc	86.62% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.