ao_alsa: always enable "plug" plugin for non-default device

This seems safer: otherwise, opening the AO could randomly fail if the
audio formats happens to be not float.

Unfortunately, this only works if the user does not select a device.
Since ALSA devices are arbitrary strings, including plugins with complex
parameters, it's not trivial or maybe even impossible to edit the string
in a way the "plug" plugin is added.

With --audio-device, it would be safe for users to select either
"default" or one of the "plughw" devices. Everything else seems
questionable.

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