Update markup.py

[CombatMaster]

Added indents and removed unnecessary brackets

Maintainer merge checklist

• [ ] Title is descriptive/clear for inclusion in release notes.
• [ ] Applied a Component: xxx label.
• [ ] Applied the api-deprecation or api-break label.
• [ ] Applied the release-highlight label to be highlighted in release notes.
• [ ] Added to the milestone version it was merged into.
• [ ] Unittests are included in PR.
• [ ] Properly documented, including versionadded, versionchanged as needed.

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[Zen-CODE]

Hi. I'm not sure how valuable these changes are I'm afraid. Are these ruff suggested changes, as kivy is not really ruff compliant? To start forcing that would touch the whole codebase. Try checking out the repo and doing ruff format....

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