Update to a supported runtime and drop org.kde.*

Update to a supported runtime

```
Info: runtime org.kde.Platform branch 5.14 is end-of-life, with reason:
The KDE 5.14 runtime is no longer supported and does not receive security updates. We strongly recommend migrating to a supported runtime.
Info: applications using this runtime:
io.github.qnapi
```

This is no longer required with any supported runtimes, the issue was fixed in Qt

https://docs.flatpak.org/en/latest/desktop-integration.html#statusnotifier

> Most implementations of StatusNotifer have dropped this requirement

https://github.com/flathub/flatpak-builder-lint/issues/ 66#issuecomment-1386033025

Inizia individuando il manifest Flatpak per io.github.qnapi e identifica il runtime org.kde.Platform 5.14 e qualsiasi voce di integrazione org.kde.*. Leggi le indicazioni Flatpak collegate sull’integrazione desktop e il contesto Qt, quindi conferma che il manifest utilizzi un runtime supportato e non richieda più tali voci.

Scritto dal modello di indicizzazione a partire dal testo della issue.