app: fix list of prop names

Author: fepitre

qubes/app.py

@@ -1664,7 +1664,8 @@ def on_domain_pre_deleted(self, event, vm):
     def on_domain_deleted(self, event, vm):
         # pylint: disable=unused-argument
         for propname in (
-            "default_guivm" "default_netvm",
+            "default_guivm",
+            "default_netvm",
             "default_fw_netvm",
             "clockvm",
             "updatevm",