[w3c/IndexedDB] transaction() exception order is wrong for invalid mode (#187)

Spec has _"If mode parameter is not "readonly" or "readwrite", throw a TypeError."_ as the first step. Implementations and tests (https://github.com/w3c/web-platform-tests/blob/master/IndexedDB/idbdatabase-transaction-exception-order.html) have the mode check last.


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https://github.com/w3c/IndexedDB/issues/187