Show headset icons for devices identifying as "Headset" in Description

A Logitech H600 / H800 headset was showing an "unknown" icon for the player device.

These devices use the following identifiers:

The sink/player device:
currentPort.name: analog-output
currentPort.description: Analog Output H600
Description: [Wireless Headset] Analog Stereo

The source/capture device:
currentPort.name: analog-input-mic
currentPort.description: Microphone H600
Description: [Wireless Headset] Analog Mono

Differential Revision: https://phabricator.kde.org/D8054