[Bug] Switching colour schemes doesn't work without restarting the GUI.

[RokeJulianLockhart]

Reproduction

1. lookandfeeltool --apply org.kde.breezedark.desktop
   flatpak run com.github.Murmele.Gittyup
   lookandfeeltool --apply org.kde.breeze.desktop

2. 

Environment

flatpak info com.github.Murmele.Gittyup

          ID: com.github.Murmele.Gittyup
         Ref: app/com.github.Murmele.Gittyup/x86_64/stable
        Arch: x86_64
      Branch: stable
     Version: v1.4.0
     License: MIT
      Origin: gittyup-origin
  Collection: 
Installation: user
   Installed: 69.9 MB
     Runtime: org.kde.Platform/x86_64/5.15-23.08
         Sdk: org.kde.Sdk/x86_64/5.15-23.08

      Commit: 3770cd879f05ac85fa25b773744a31b9fa50b4f4f79db847f4e6d6e3099d2aa1
     Subject: Export com.github.Murmele.Gittyup
        Date: 2024-05-14 20:02:39 +0000

kinfo

Operating System: Fedora Linux 40
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.10-200.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7600X 6-Core Processor
Memory: 30.5 GiB of RAM
Graphics Processor: AMD Radeon RX 5700