[nativescript-stripe][ios] onPaymentSuccess gets called even when capturePayment handler throws error

Calls to the user-implemented capturePayment handler that result in error end up triggering onPaymentSuccess listener.

I believe this is due to the following code in index.ios.js:

    StripePaymentDelegate.prototype.paymentContextDidCreatePaymentResultCompletion = function (paymentContext, paymentResult, completion) {
        StripeStandardConfig.shared.backendAPI
            .capturePayment(paymentResult.paymentMethod.stripeId, paymentContext.paymentAmount, createShippingMethod(paymentContext), createAddress(paymentContext.shippingAddress))
            .then(function (value) {
            completion(STPPaymentStatus.Success, null);
        })
            .catch(function (e) {
            completion(null, createError('PaymentError', 100, e));
        });
    };

Passing null to completion() results in StripePaymentDelegate.prototype.paymentContextDidFinishWithError = function (paymentContext, status, error) being called with status equal to 0, which is the value of STPPaymentStatus.Success. The following change resolves the issue for me:

            .catch(function (e) {
            completion(STPPaymentStatus.Error, createError('PaymentError', 100, e));

Version: 8.0.2

Start in index.ios.js at StripePaymentDelegate.prototype.paymentContextDidCreatePaymentResultCompletion and trace how capturePayment rejection reaches the completion callback. Verify the iOS payment flow reports an error rather than success when capturePayment throws, and check the related payment delegate behavior for regression coverage.