[w3c/IndexedDB] Shouldn't keyPath properties be (DOMString or sequence<DOMString>)? (#235)

`keyPath` for IDBObjectStore and IDBIndex is defined as `any` but then the spec says:

>The key path is converted as a DOMString (if a string) or a sequence<DOMString> (if a list of strings), per [WEBIDL].

I think it should be `DOMString or sequence<DOMString>` then.

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