Fix double finished callback when using Apple Pay
Fix double finished callback when using Apple Pay

NewAmsterdamLabs/stripe-ios,stripe/stripe-ios,fbernardo/stripe-ios,fbernardo/stripe-ios,stripe/stripe-ios,stripe/stripe-ios,NewAmsterdamLabs/stripe-ios,NewAmsterdamLabs/stripe-ios,stripe/stripe-ios,fbernardo/stripe-ios,stripe/stripe-ios,stripe/stripe-ios,NewAmsterdamLabs/stripe-ios,fbernardo/stripe-ios