Fix UNIT_Dem_TEST failure on Ubuntu 20.04

[adityapande-1995]

Signed-off-by: Aditya aditya050995@gmail.com

🦟 Bug fix

Fixes #https://github.com/gazebosim/gazebo-classic/issues/2828

Summary

Differences in versions of libproj leads to different results in coordiante transformation. This PR proposes worksarounds for that.

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [x] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [x] 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.

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