Apply suggestion from @nicoddemus

Author: nicoddemus

src/_pytest/python.py

@@ -903,7 +903,7 @@ def make_unique_parameterset_ids(self) -> list[str | _HiddenParam]:
         resolved_ids = list(self._resolve_ids())
         # All IDs must be unique!
         if len(resolved_ids) != len(set(resolved_ids)):
-            if self.config and self.config.cache._config.getoption(
+            if self.config and self.config.getoption(
                 "require_unique_paramset_ids"
             ):
                 duplicate_indexs = defaultdict(list)