Describe the bug

After we updated Qt in #3262 Windows now supports a dark mode. However, the server title does not show up in the correct color:

needs to be adapted most likely.

To Reproduce

Download latest build from main.
Install on Windows 11 with dark mode enabled
Connect to server, see title in wrong color.
Disconnect from server

Expected behavior

The server title should have a visible color.

Screenshots

Operating system

Windows 11

Version of Jamulus

jamulus_3.11.0dev-0e9a425 from https://github.com/ann0see/jamulus/actions/runs/11150598783?pr=160
Additional context

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