requests: [inveniosoftware#855] 5) don't display membership req. in community Requests

Author: fenekku

Diff for: invenio_communities/communities/services/service.py

@@ -169,6 +169,8 @@ def search_community_requests(
                 must=[
                     dsl.Q("term", **{"receiver.community": community_id}),
                     ~dsl.Q("term", **{"status": "created"}),
+                    # Excluding explicitly for now
+                    ~dsl.Q("term", **{"type": "community-membership-request"})
                 ],
             ),
             **kwargs,