monitors/bluez: request device ports take loopback nodes into account

Take the loopback nodes into account also in device Routes.

Some Pulseaudio applications (eg GNOME) determine what to do based on
device ports, so make sure they are consistent with what nodes will be
emitted.

src/scripts/monitors/bluez.lua

@@ -546,6 +546,14 @@ function checkProfiles (dev)
     return
   end
 
+  -- Setup Route/Port correctly for loopback nodes
+  local param = Pod.Object ({
+      "Spa:Pod:Object:Param:Props",
+      "Props",
+      params = Pod.Struct ({ "bluez5.autoswitch-routes", true })
+  })
+  dev:set_param("Props", param)
+
   -- Create the source loopback device if never created before
   local source_loopback = spa_device:get_managed_object (LOOPBACK_SOURCE_ID)
   if source_loopback == nil then