Fix darkmode in {} of Citation Relations tab of the entry editor

[ThiloteE]

JabRef version

6.0-alpha2

Operating system

Windows

Details on version and operating system

Windows 10

Checked with the latest development build (copy version output from About dialog)

• I made a backup of my libraries before testing the latest development version.
• I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

1. Add an entry to your library.
2. Open the entry editor by double clicking on the entry.
3. Switch to the Citation Relations tab.
4. The {} symbol shows the bibtex source. The dialog looks horrible in dark mode and needs a fix:

Appendix

No response

[ankamde]

/assign-me

[github-actions]

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