Allow price change for recurring user upgrades to update existing subscriptions when using PayPal/Stripe as payment providers

[Mouth]

Re: https://xenforo.com/community/threa...-effect-on-current-and-new-purchasers.180761/

If changing the price for a recurring user upgrade, please add a tick-box/prompt for existing subscriptions to be updated with the payment provider.

Ref: https://developer.paypal.com/docs/api/subscriptions/v1/#subscriptions_patch and https://stripe.com/docs/api/subscriptions/update

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