Connected device detection broken when using wireplumber 0.5.13

[jamescarter2001]

The latest wireplumber version appears to break the MediaController class's "isActiveOutputDeviceAirPods" check, affecting features such as ear detection and conversational awareness. This appears to be due to a name formatting change when querying the default sink name.

Steps to reproduce in the current version:

1. With wireplumber 0.5.13 installed, start librepods and connect AirPods
2. Start playing some audio on your system
3. Remove an AirPod. Ear detection should fail