[w3c/browser-payment-api] PaymentRequest type checks (#306)

The following should be combined:

> If details.total.amount.value is not a valid decimal monetary value, then throw a TypeError.
> If the first character of details.total.amount.value is U+002D HYPHEN-MINUS, then throw a TypeError. total must be a non-negative amount.

We should just define a "valid non-negative currency value" as an algorithm that calls into "valid decimal monetary value". 


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