Removal of extraneous parenthesis in tests (#33670)

* Removal of extraneous parenthesis

* Process review suggestions

* Apply suggestions from code review

Co-authored-by: Martin Hjelmare <marhje52@gmail.com>

tests/components/folder_watcher/test_init.py

@@ -20,7 +20,7 @@ async def test_invalid_path_setup(hass):
 async def test_valid_path_setup(hass):
     """Test that a valid path is setup."""
     cwd = os.path.join(os.path.dirname(__file__))
-    hass.config.whitelist_external_dirs = set((cwd))
+    hass.config.whitelist_external_dirs = {cwd}
     with patch.object(folder_watcher, "Watcher"):
         assert await async_setup_component(
             hass,