community/pipewire/pulseaudio: clean up -alsa "provides"

Merged Ghost User requested to merge (removed):palsa into master

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these are wrong and don't actually do anything (except allow pipewire-alsa to satisfy a pulseaudio-alsa dep), nor do they conflict with eachother. things that depend on a "pipewire audio stack" or "pulseaudio audio stack" should explicitly be depending on these if they are needed, not depends=pulseaudio-alsa and expecting one of them to be there.

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