[w3c/IndexedDB] create/deleteObjectStore: InvalidStateError logic does not match impls/tests (#192)

Spec has:

> Let transaction be the upgrade transaction associated with database. If one does not exist or it is finished, throw an "InvalidStateError" DOMException.

But in this case, a TransactionInactiveError is thrown instead in Chrome/Firefox and asserted as such in tests:

```js
tx.abort();
db.createObjectStore('s'); // throws TransactionInactiveError
```

Noted by the ever vigilant @brettz9 over in https://github.com/w3c/web-platform-tests/issues/5612 but it's the spec that's wrong here since impls/tests match.

Unfortunately, the "finished" notion for transactions is a bit squishy. Spec-wise we may be able to just drop the "or it is finished" bit from these methods and then tidy up the transaction lifecycle at some point in the future.

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