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

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1. Change in CHANGELOG.md described in a way that is understandable for the average user (if applicable)
2. Tests created for changes (if applicable)
3. Manually tested changed features in running JabRef (always required)
4. Screenshots added in PR description (for UI changes)
5. Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
6. Checked documentation: 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.