apply-routes.lua: Always set save=false when applying routes

When applying new routes, we always want the save property to be false because
it is done by WirePlumber (not the user). WirePlumber applies routes when
restoring them from the state file, or when finding the best routes after the
profile has changed. In both cases, it does not make sense to set save=true.

src/scripts/device/apply-routes.lua

@@ -83,7 +83,7 @@ AsyncEventHook {
             index = route_info.index,
             device = device_id,
             props = Pod.Object (props),
-            save = route_info.save,
+            save = false,
           }
 
           log:debug (param,