Drop the default_host parameter from the new NodesManager test

default_host is a module-level constant in tests/test_asyncio/test_cluster.py,
not a fixture, so taking it as a test parameter made pytest error at setup.

Author: eeshsaxena

tests/test_asyncio/test_cluster.py

@@ -3142,7 +3142,6 @@ async def test_move_node_to_end_of_cached_nodes(self) -> None:
     @pytest.mark.fixed_client
     async def test_set_nodes_disconnects_removed_node_connections_immediately(
         self,
-        default_host: str,
     ) -> None:
         """
         Test removed nodes are fully disconnected immediately, including in-use connections.