[bug] Cannot see or remove password in Switchbot App if added to Keypad with `add_password`.

If you add a password to a Keypad through the `add_password` API, it does not appear in the Switchbot App to manage.  This prevents removing the password later, and there is no API in the library to remove the password either.  I have confirmed that a password added through this API will work on the keypad. 