Dark theme in OSX breaks look&feel.

White text boxes also have white text in them, making the app basically unusable.

Details for the issue

What did you do?

Installed & ran app for first time

What did you expect to see?

The screenshot on https://sqlitebrowser.org/

What did you see instead?

Useful extra information

The info below often helps, please fill it out if you're able to. :)

What operating system are you using?

• Windows: ( version: ___ )
• Linux: ( distro: ___ )
• Mac OS: ( _version: 10.14.3)
• Other: ___

What is your DB4S version?

• 3.11.1
• 3.11.0
• 3.10.1
• Other: ___

Did you also

• Try out the latest nightly version: https://github.com/sqlitebrowser/sqlitebrowser#nightly-builds
• Search for an existing similar issue: https://github.com/sqlitebrowser/sqlitebrowser/issues?utf8=%E2%9C%93&q=is%3Aissue%20