Don't load old notifications from uninstalled apps

### What Happened?

I had installed an app to test it, it sent some notifications, and then later I uninstalled it. It's old notifications were displayed with an image-missing icon

### Steps to Reproduce

1. Install an app that sends notifications
2. Receive notifications in the indicator
3. uninstall the app
4. restart and notice that the icon is now unavailable and the notifications remain

### Expected Behavior

We should probably just remove the notifications since they probably aren't of value anymore if the user uninstalled the app they belong to

### OS Version

6.x (Odin)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_