crypto: fix webcrypto ECDH JWK import

This fixes the importKey operation when importing a JWK for the ECDH
algorithm. As per the Web Crypto API specification the JWK `alg`
property is not checked (as opposed to ECDSA).

PR-URL: https://github.com/nodejs/node/pull/35855
Fixes: https://github.com/nodejs/node/issues/35812


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>