monitor: alsa: Don't make the loopback device node virtual by default

src/scripts/monitors/alsa.lua

@@ -81,6 +81,7 @@ function CreateLoopback (properties)
   device_props = Json.Object {
     ["node.name"] = string.format ("alsa_loopback_device.%s", name),
     ["node.description"] = desc,
+    ["node.virtual"] = false,
     ["media.class"] = device_media_class,
     ["audio.channels"] = channels,
     ["audio.position"] = position,