[w3c/IndexedDB] Missing durability attribute in the IDBTransaction interface (#316)

Which should have been added in the recent commit
https://github.com/w3c/IndexedDB/commit/1a519e7f0a12de4acffc641d3254c1c2d34d380a
probably, to be the following form:

```
interface IDBTransaction : EventTarget {...
    readonly attribute IDBTransactionDurability durability;
...}
```

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