fix issue w/ crypto in CertChainValidationEngine

[bdehamer]

When calling the verify function on the CertificateChainValidationEngine with an explicit crypto parameter you get an error stating "Please call 'setEngine' before call to 'getEngine'"

const cryptoEngine = new pkijs.CryptoEngine({
  name: 'mycrypto',
  crypto: new Crypto(),
});

 const ccve = new pkijs.CertificateChainValidationEngine({
  certs: [rootCert, intCert, signingCert],
  trustedCerts: [rootCert]
});

const result = await ccve.verify({}, cryptoEngine);
console.log(result);

{
  result: false,
  resultCode: -1,
  resultMessage: "Please call 'setEngine' before call to 'getEngine'"
}

The issue seems to be that the verify function doesn't pass the supplied crypto value down to invocation of findIssuer.

[coveralls]

Coverage remained the same at 74.291% when pulling a6da39674a66f7fe233f16c7ee5de334916f6a0e on bdehamer:cert-chain-engine-fix into 3e3e61439a49a4a8b712bc30641c75b7c8740a8a on PeculiarVentures:master.

[microshine]

@bdehamer Thank you for your update. The new version pkijs@3.0.7 is available