fix(emqx_retainer): fix function 'create_resource'

apps/emqx_retainer/src/emqx_retainer.erl

@@ -480,6 +480,7 @@ create_resource(Context, #{type := DB} = Config) ->
     ResourceID = erlang:iolist_to_binary([io_lib:format("~ts_~ts", [?APP, DB])]),
     case emqx_resource:create(
            ResourceID,
+           <<"default">>,
            list_to_existing_atom(io_lib:format("~ts_~ts", [emqx_connector, DB])),
            Config) of
         {ok, already_created} ->