[Bug Report] System color scheme change is not respected until WALC is restarted

[major-mayer]

Describe the bug
I noticed that when you change the GTK color scheme of your system while WALC is running, it doesn't react to this change.
Only when you restart the application, the theme is switched from light to dark or vice versa.

WALC Installation Type: AUR

To Reproduce
Steps to reproduce the behavior:

1. Open WALC
2. Change the system's color scheme to light/ dark mode
3. WALC doesn't change the Whatsapp color theme (unlike e.g. if you open WhatsApp in browser)

Expected behavior
The theme of WhatsApp should change immediately and not only on restart.

Did you try closing and then opening it back?: Yes, but fact that you have to do that, is the issue in the first place.

Screenshots
Wouldn't help I guess

System Information (please complete the following information):
Operating System: Manjaro Linux
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.6.52-1-MANJARO (64-bit)
Graphics Platform: Wayland

Additional context
Add any other context about the problem here.