macOS: tab bar goes black in fullscreen after disconnecting the external display

[bo2themax]

1. Create a new window in an external display
2. Enter fullscreen there
3. Create new tabs in fullscreen
4. Disconnect that display

This is reproducible with both default config and macos-titlebar-style = tabs

Related discussion and pr:

• Tab bar getting invisible randomly when switching tabs #5389
• fix(macos): fix fullscreen tab bar disappearing after monitor disconnect #10253
• macOS: sync appearance after screen parameters change #13407

I don't think the mentioned pr above are the right approach to fix it, but feel free to try them yourself.