gh-36191: fix E228 and E225 in schemes/
fix pycodestyle warnings E228 and E225 in schemes
this was done using `autopep8`
### :memo: Checklist
- [x] The title is concise, informative, and self-explanatory.
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URL: https://github.com/sagemath/sage/pull/36191
Reported by: Frédéric Chapoton
Reviewer(s): Kwankyu Lee
