slapos_subscription_request: Return the real object rather them the brain

master/bt5/slapos_subscription_request/ExtensionTemplateItem/portal_components/extension.erp5.SlapOSSubscriptionRequest.py

@@ -54,5 +54,5 @@ def SubscriptionRequest_searchExistingUserByEmail(self, email, REQUEST=None):
     validation_state="validated")
 
   if len(person_list):
-    return person_list[0]
+    return person_list[0].getObject()