Remove unused token variable from JSON cookie test

- Fix pre-commit ruff check failure F841 (unused variable)
- The test doesn't require authentication to verify JSON string preservation

Co-Authored-By: masen@reflex.dev <masen@reflex.dev>

Author: devin-ai-integration[bot]

tests/integration/test_client_storage.py

@@ -818,8 +818,6 @@ def set_sub(var: str, value: str):
         input_value_input.send_keys(value)
         set_sub_state_button.click()
 
-    token = poll_for_token()
-
     # Get references to cookie elements
     c1 = driver.find_element(By.ID, "c1")
     c2 = driver.find_element(By.ID, "c2")