org.kde.KStyle.Adwaita 5.15-22.08 not loading Adwaita-dark for application

As a follow-up to #11, I must inform that the theme is not loading properly for Qbittorrent.

### Qbittorrent
```
qBittorrent - An open-source Bittorrent client

ID: org.qbittorrent.qBittorrent
Ref: app/org.qbittorrent.qBittorrent/x86_64/stable
Arch: x86_64
Branch: stable
Version: 4.4.5
License: GPL-2.0 and OpenSSL
Origin: flathub
Collection: org.flathub.Stable
Installation: system
Installed: 14,7 MB
Runtime: org.kde.Platform/x86_64/5.15-22.08
Sdk: org.kde.Sdk/x86_64/5.15-22.08

Commit: 997c137fc8fa75c2ba2d2b0e6a85ea3e9aa4ae28940f8b7dd755cec8013a92aa
Parent: caaa3fc438f7808badb445cf0dcbcc77aef574ff5757e07d0544e30bd56ba313
Subject: Bump SDK version to 5.15-22.08 (#90) (2f094d86)
Date: 2022-09-10 04:50:55 +0000
```

### Adwaita
```

Adwaita theme - Adwaita widget theme matching the GNOME adwaita theme

ID: org.kde.KStyle.Adwaita
Ref: runtime/org.kde.KStyle.Adwaita/x86_64/5.15-22.08
Arch: x86_64
Branch: 5.15-22.08
Origin: flathub
Collection: org.flathub.Stable
Installation: system
Installed: 16,2 MB

Commit: 7496a6a69ee3a690727994acb2f37840b5aef1c9551803e0e6135c8e727528f4
Subject: Reformat (a77e9b78)
Date: 2022-09-12 08:28:53 +0000
```

When using another Qt application like kid3, it does work. For reference, my host system is Fedora 36 Workstation, with dark-theme enabled.


## Testing
I looked at the documentation of [Adwaita-qt](https://github.com/FedoraQt/adwaita-qt) and I found that I have to manually start the application with `-style Adwaita-dark` for it to take effect. Not sure what the appropriate cause of action would be here, but I do hope that this can be fixed. Should I report it upstream?