SoundSourceProxy Supports only two Soundsources per file extension

[mixxxbot]

Reported by: daschuer
Date: 2021-12-27T17:31:08Z
Status: In Progress
Importance: Low
Launchpad Issue: lp1955840

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This is not a real issue, because we do not have more than two SoundSources per file type.
But it is a hard to find programming error which might be relevant later, that should be fixed.

[mixxxbot]

Commented by: daschuer
Date: 2021-12-27T22:16:12Z

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#4584

[Swiftb0y]

Already fixed by #4584 apparently