Show apps that appear in PermissionStore

### What Happened?

I would like to disable the sound for discord notifications

discord however does not appear in the list of apps in the notifications plug

discord is installed from flatpak, systemwide, but other systemwide flatpaks are present

### Steps to Reproduce

Install discord (from flatpak)
Receive messages
Look into notification plug
No discord in the list

### Expected Behavior

discord appears in the list, and i can select it and disable or enable elements like sound notification

### OS Version

8.x (Early Access)

### Session Type

Secure Session (Wayland)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_