[w3c/permissions] Turn PermissionSetParameters.descriptor into an object (Issue #443)

The Set Permission step 3 does: https://w3c.github.io/permissions/#webdriver-command-set-permission

>3. Let rootDesc be parameters.[descriptor](https://w3c.github.io/permissions/#dom-permissionsetparameters-descriptor).

But `parameters` is a JS object here, so it can't just access the IDL property but should do some JS `Get()`, as Streams doe in https://streams.spec.whatwg.org/#abstract-opdef-setupcrossrealmtransformreadable.

But an even better way to fix it is just to turn `decriptor` as an object, which would allow `Let rootDesc be parametersDict.descriptor`.

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