pulseaudio-dlna output devices not shown in output list

## What Happened
The devices provided by pulseaudio-dlna are not shown in the output devices section. They show up fine in PAVU control.

## Expected Behavior
The devices provided by pulseaudio-dlna are shown in the output devices selection.

## Steps to Reproduce

1. Install pulseaudio-dlna
2. Run it (doesn't matter if current user or root)

### Logs

## Platform Information

Elementary OS 5.1.7 with all the latest updates according to app center.