Re: [w3c/payment-handler] Only allows instrument.set() in active service worker (#224)

@rsolomakhin PTAL

I think other methods(`get()`, `delete()` and so on) no needs the check because instruments storage always empty before calling `set()`.

`get()` will resolve `undefined`.
`delete()` will resolve `false`.
`keys()` will resolve `empty array`.
`has()` will resolve `false`.
`clear()` is unmeaningful because the storage is already empty.

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