AES-CBC export operation checks non-existent variable

[BenWiederhake]

Specifically the AES-CBC has a weird way to initialize the jwk:

https://w3c.github.io/webcrypto/#aes-cbc-operations

This seems to be a simple copy-paste mistake: The key parameter passed to exportKey is of known type CryptoKey, and therefore cannot be of type JsonWebKey dictionary. Also, this step is identical to the importKey step, which is NOT the case for any other algorithm. (All other AES-algorithms instead initialize jwk with the step Let jwk be a new [JsonWebKey](https://w3c.github.io/webcrypto/#dfn-JsonWebKey) dictionary.)

Or is there a keyData variable that I overlooked, or some other way this is intended?