When inserting an audio CD, device notifier detects it, but the button you get to the right is the "mount" button, which is useless for audio CDs, which cannot be mounted/umounted.

Instead, device notifier should always show the "eject" button for audio CDs. Dolphin with audiocd:/ does this correctly.

Reproducible: Always

Steps to Reproduce:
1. Insert audio CD.
2. Click on device notifier. Note the "mount" button presented on the right of the audio CD under available devices.