Implement reset for MainTablePreferences

[nbelwang]

Closes #14413

Hello! This is my first contribution. I followed the instructions in #14400 and implemented a private default constructor, getDefault, and setAll method in MainTablePreferences, and added them into JabRefGuiPreferences. I put empty lists for ColumnPreferences in the default constructor because ColumnPreferences doesn't have the getDefault() or setAll() yet, I hope that is correct.

Steps to test

I followed the instructions from the developer documentation and ran the final build system check, which passed, but I was unsure how else to test this as I am not familiar with importing or exporting preferences into JabRef.

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• [/] I manually tested my changes in running JabRef (always required)
• [/] I added JUnit tests for changes (if applicable)
• [/] I added screenshots in the PR description (if change is visible to the user)
• [/] I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• [/] I checked the user 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 updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

[github-actions]

Hey @nbelwang! 👋

Thank you for contributing to JabRef!

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[nbelwang]

I'm a bit confused on how to resolve my failing checks, I ran rewriteRun which passed, but there were no changes for me to commit. I'm not sure what my other failing tests mean either.

[koppor]

CI says following error

* What went wrong:
Could not determine the dependencies of task ':jablib:compileJava'.
> Failed to query the value of extension 'errorprone' property 'enabled'.
   > Failed to calculate the value of task ':jablib:compileJava' property 'javaCompiler'.
      > Cannot find a Java installation on your machine (Linux 6.11.0-1018-azure amd64) matching: {languageVersion=24, vendor=Amazon Corretto, implementation=vendor-specific, nativeImageCapable=false}. No matching toolchain could be found in the configured toolchain download repositories.

This is not about your change, but some infrastructure issue.