Extend duplicate-code disable to cover tempdir helper

Move the ``# pylint: enable=duplicate-code`` comment after the
``tempdir`` context manager so it is covered by the existing
suppression scope.

Author: Pierre-Sassoulas

tests/config/test_find_default_config_files.py

@@ -60,9 +60,6 @@ def fake_home() -> Iterator[None]:
         shutil.rmtree(folder, ignore_errors=True)
 
 
-# pylint: enable=duplicate-code
-
-
 @contextlib.contextmanager
 def tempdir() -> Iterator[str]:
     """Create a temp directory and change the current location to it.
@@ -83,6 +80,9 @@ def tempdir() -> Iterator[str]:
         shutil.rmtree(abs_tmp)
 
 
+# pylint: enable=duplicate-code
+
+
 @pytest.mark.usefixtures("pop_pylintrc")
 def test_pylintrc() -> None:
     """Test that the environment variable is checked for existence."""