[Bug] purchasedProductID is not correct

[chbeer]

Steps to Reproduce:

• Create different subscriptions in the same group
• Buy one subscription
• -> FreemiumKit is changed, purchasedProductID is correct
• Buy another subscription in the same group
• -> FreemiumKit.shared.purchasedProductID is not changed, shows the old product-ID
• PaidStatusView shows the correct title of the second purchased subscription

Expected Behavior:

purchasedProductID returns correct product-id and is changed

Current Behavior:

purchasedProductID returns product-id of old purchase

Environment

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