[w3c/IndexedDB] Nit in `deleteDatabase` error example (#196)

For the recent addition for `deleteDatabase` stating:

> Delete db. If this fails for any reason, return an appropriate error (e.g. "QuotaExceededError" or "UnknownError" DOMException).

...I am guessing that the use of "QuotaExceededError" was a carry-over from the `open` example as it wouldn't seem to me to be a valid error one would encounter on attempting to delete a database.

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