Fix lint

qutebrowser/config/config.py

@@ -608,7 +608,7 @@ class ConfigContainer:
         # "c.content.host_blocking" doesn't actually exist. To avoid an AttributeError
         # which leads to a confusing error message, return another ConfigContainer so
         # that the chain can keep going.
-        return self._with_prefix(name)
+        return self._with_prefix(name)  # type: ignore[unreachable]
 
     def __setattr__(self, attr: str, value: Any) -> None:
         """Set the given option in the config."""