address review

Author: blink1073

pymongo/topology_description.py

@@ -325,11 +325,7 @@ def apply_selector(
             return [description] if description else []
 
         # Primary selection fast path.
-        if (
-            custom_selector is None
-            and self.topology_type == TOPOLOGY_TYPE.ReplicaSetWithPrimary
-            and type(selector) is Primary
-        ):
+        if self.topology_type == TOPOLOGY_TYPE.ReplicaSetWithPrimary and type(selector) is Primary:
             for sd in self._server_descriptions.values():
                 if sd.server_type == SERVER_TYPE.RSPrimary:
                     sds = [sd]