crypto: fix webcrypto Curve25519 and Curve448 spki/pkcs8 imports

Fixes the following webcrypto key algorithm' SPKI and PKCS8 imports

{ name: 'ECDH', namedCurve: 'NODE-X25519' }
{ name: 'ECDH', namedCurve: 'NODE-X448' }
{ name: 'NODE-ED25519', namedCurve: 'NODE-ED25519' }
{ name: 'NODE-ED448', namedCurve: 'NODE-ED448' }