Force no fullscreen

[calixtus]

This is a test PR
tries to fix #10731
Please test with Mint/Cinnamon

Mandatory checks

• I own the copyright of the code submitted and I licence it under the MIT license
• 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: Is the information available and up to date? If not, I outlined it in this pull request.
• 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.

[github-actions]

The build of this PR is available at https://builds.jabref.org/pull/11991/merge.

[koppor]

Report from #10731 (comment)

• If Jabref is closed while in fullscreen (e.g. through ALT+F4), it will start in fullscreen on the next startup.
• If Jabref is taken out of fullscreen, it becomes windowed and maximised. If I close it while windowed+maximised, it will start in fullscreen on the next startup, and not windowed+maximised.
• If Jabref is taken out of fullscreen and then unmaximised, it will open windowed+unmaximised on the next startup.

[Siedlerchr]

I observed that the property isMaximized reports wrong values on closing JabRef under mac when it was set to true at startup. Even after resizing it never changed