gh-37797: fix the category of quasi-modular form rings
fir the category of some rings of quasi-modular forms
See https://ask.sagemath.org/question/76909/
### :memo: Checklist
- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [x] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.
URL: https://github.com/sagemath/sage/pull/37797
Reported by: Frédéric Chapoton
Reviewer(s): Sebastian A. Spindler, Seewoo Lee
