Incorrect transactionReason when a previously cancelled subscription was purchased again

[nahlebn1k]

Hello, I discovered that transactionReason was incorrectly set to RENEW instead of PURCHASE, for iOS purchases that had been previously cancelled and then purchased again in the purchaseUpdatedListener/onPurchaseSuccess callback.

Since the purchaseUpdatedListener/onPurchaseSuccess callback also returns all staged renewal events together with the new purchase, I used transactionReason as a reliable flag to identify 100% new transactions and skip old renewals in react-native-iap versions 12.x.x and 13.x.x. However, in the new version this logic is broken.

Created PR with fix here hyodotdev/openiap-apple#21.