[w3c/permissions] Disambiguate "parameters" in Set Permission steps (Issue #440)

https://w3c.github.io/permissions/#webdriver-command-set-permission

> 1. Let parameters be the parameters argument, [converted to an IDL value](https://webidl.spec.whatwg.org/#dfn-convert-ecmascript-to-idl-value) of type [PermissionSetParameters](https://w3c.github.io/permissions/#dom-permissionsetparameters). If this throws an exception, return an [invalid argument](https://www.w3.org/TR/webdriver1/#dfn-invalid-argument) [error](https://www.w3.org/TR/webdriver1/#dfn-error).
> 2. Let rootDesc be parameters.[descriptor](https://w3c.github.io/permissions/#dom-permissionsetparameters-descriptor).

But it's not clear what the "parameters" in the second step refers to. It should be the argument, or otherwise `rootDesc` won't have extra members from e.g. MidiPermissionDescriptor. That should be made clear.

The Streams spec uses `Dict` to disambiguate in a similar case: https://streams.spec.whatwg.org/#rs-constructor

>1. Let underlyingSourceDict be underlyingSource, [converted to an IDL value](https://webidl.spec.whatwg.org/#dfn-convert-ecmascript-to-idl-value) of type [UnderlyingSource](https://streams.spec.whatwg.org/#dictdef-underlyingsource).

We should probably follow that here.

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