sage

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gh-36247: fix E228 and E225 in categories/ Fix pycodestyle warnings E228 and E225 in src/sage/categories This was scripted using autopep8 ### :memo: Checklist - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. URL: https://github.com/sagemath/sage/pull/36247 Reported by: Frédéric Chapoton Reviewer(s): David Coudert