component pubsub: remove node creation restriction to local user only:

External users should be able to create nodes, it is necessary for many feature such as
blog comments.

rel 476

libervia/backend/plugins/plugin_comp_pubsub/__init__.py

@@ -552,9 +552,6 @@ class PubsubResource(pubsub.PubSubResource):
         assert request.sender is not None
         requestor_jid = request.sender.userhostJID()
 
-        if not client.is_local(requestor_jid):
-            raise error.StanzaError("forbidden")
-
         node_id = request.nodeIdentifier or f"generic/{shortuuid.uuid()}"
 
         config = PubsubNodeConfig()