Return wrapped_func in decorator

In the `protected_callback` decorator, it should be the same to just return the `wrapped_func` function instead of wrapping it inside of `wrap`.

Reference:
https://github.com/plotly/dash-auth/blob/1599f97319e5d610f580dcd4f7a748c4aa945845/dash_auth/group_protection.py#L209