amnesia user should not be in the audio group

The amnesia user should not be in the audio group. ConsoleKit automatically uses ACLs to give logged in users access to /dev/snd/, so amnesia should not need to have access directly.

See https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/PerfectSetup/ and https://wiki.ubuntu.com/Audio/TheAudioGroup (which also applies to Debian).

Feature Branch: feature/12209-dont-add-amnesia-to-the-audio-group

Original created by @cypherpunks on 12209 (Redmine)

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