[w3c/IndexedDB] Should it be clarified that `IDBDatabase.close()` is idempotent? (#222)

By reading the spec, it's very obviously implicit that it's idempotent, but the [steps to close a database connection](https://w3c.github.io/IndexedDB/#close-a-database-connection) might want to clarify this and make it explicit by adding an extra initial step like "If the close pending flag is set, abort these steps".

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