Regression: Reducing the order total to 0 after creating a payment intent results in payment with previous amount

Issue is in the destructor, which instead of cancelling a zero-dollar payment intent, attempts to update the amount to zero.

This is invalid, according to Stripe, which throws an exception:

The amount must be greater than or equal to the minimum charge amount allowed for your account and the currency set (https://docs.stripe.com/currencies#minimum-and-maximum-charge-amounts). If you want to save a Payment Method for future use without an immediate payment, use a Setup Intent instead: https://docs.stripe.com/payments/setup-intents

The exception gets caught and logged, but the payment intent does not get removed.
Subsequently, upon checkout, the payment intent is processed with the incorrect amount.

Opened MR 180, which cancels zero-balance payment intents during the destruct method of the order payment intent subscriber.

Not sure this is the best way to handle it, but it's working for me.