BUG: fix export ellipses to kml function

[Gui-FernandesBR]

Pull request type

• [ ] Code changes (bugfix, features)
• [ ] Code maintenance (refactoring, formatting, tests)
• [ ] ReadMe, Docs and GitHub updates
• [ ] Other (please describe):

Checklist

• [ ] Tests for the changes have been added (if needed)
• [ ] Docs have been reviewed and added / updated
• [ ] Lint (black rocketpy/ tests/) has passed locally
• [ ] All tests (pytest tests -m slow --runslow) have passed locally
• [ ] CHANGELOG.md has been updated (if relevant)

Current behavior

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New behavior

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Breaking change

• [ ] Yes
• [ ] No

Additional information

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