Fix save actions

[koppor]

This fixes #9881.

While playing around, I found out that we had two major issues:

1. The order of the save actions was not retained. They were sorted alphabetically by field. I think, as user, I want to have some logical order of the fields (and not JabRef reordering my things)
2. The remove_unicode_formatter was not parsed. Never. Therefore, I took the liberty and adapted the name to the name of the class - and enabled its parsing.

As a result, no save actions are written if they are the default.

More info: The list of save actions was compared as list for checking if they are the default. Since that list was not ordered by field name (in #9126), it was always different.

### Compulsory checks
- [x] Change in `CHANGELOG.md` described in a way that is understandable for the average user (if applicable)
- [ ] Tests created for changes (if applicable)
- [ ] Manually tested changed features in running JabRef (always required)
- [ ] Screenshots added in PR description (for UI changes)
- [ ] [Checked developer's documentation](https://devdocs.jabref.org/): Is the information available and up to date? If not, I outlined it in this pull request.
- [ ] [Checked documentation](https://docs.jabref.org/): Is the information available and up to date? If not, I created an issue at <https://github.com/JabRef/user-documentation/issues> or, even better, I submitted a pull request to the documentation repository.