[w3c/payment-request] Meaning of canMakePayment() (#800)

We discovered during testing that each implementation have slightly different definitions of "can make payment". During the F2F, we came to a consensus that "canMakePayment" means "the user agent supports the PMIs" - but it does not mean that there is a payment instrument set up. We concluded that we might add something to check if there is an active instrument in the future. I'll file a different bug for that. 

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https://github.com/w3c/payment-request/issues/800