Audaspace: support the device list returned by the new audaspace library.

- use the device names returned from the library.
- system settings UI changed as new audaspace might contain longer and more device names.

release/scripts/startup/bl_ui/space_userpref.py

@@ -411,9 +411,9 @@ class USERPREF_PT_system(Panel):
         col.separator()
 
         col.label(text="Sound:")
-        col.row().prop(system, "audio_device", expand=True)
+        col.row().prop(system, "audio_device", expand=False)
         sub = col.column()
-        sub.active = system.audio_device != 'NONE'
+        sub.active = system.audio_device != 'NONE' and system.audio_device != 'Null'
         #sub.prop(system, "use_preview_images")
         sub.prop(system, "audio_channels", text="Channels")
         sub.prop(system, "audio_mixing_buffer", text="Mixing Buffer")