[alsa] use "default" as the default card name instead of "default:0"

[Scott Ritchie]

use "default" as the default card name instead of "default:0"

This patch is by Karsten Elfenbein <kelfe at gmx.de> posted at Bug 10942,
I'm just putting it to wine-patches for him.

http://bugs.winehq.org/show_bug.cgi?id=10942

Thanks,
Scott Ritchie
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