caucase.wsgi: Fix CORS cookie path.

Thanks, modern pylint !

caucase/wsgi.py

@@ -687,7 +687,7 @@ class Application(object):
     Returns a Morsel instance.
     """
     cookie = SimpleCookie({self._cors_cookie_id: value})[self._cors_cookie_id]
-    cookie['path'] = environ.get('SCRIPT_NAME') or '/',
+    cookie['path'] = environ.get('SCRIPT_NAME') or '/'
     cookie['max-age'] = A_YEAR_IN_SECONDS
     # No "secure" flag: cookie is not secret, and is protected against
     # tampering on client side.