yubikey: check with correct subkey id for sign operation

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpSignEncrypt.java

@@ -571,7 +571,7 @@ public class PgpSignEncrypt {
                             new SignEncryptResult(SignEncryptResult.RESULT_PENDING_NFC, log);
                     // Note that the checked key here is the master key, not the signing key
                     // (although these are always the same on Yubikeys)
-                    result.setNfcData(mSignatureMasterKeyId, e.hashToSign, e.hashAlgo, e.creationTimestamp, mSignaturePassphrase);
+                    result.setNfcData(mSignatureSubKeyId, e.hashToSign, e.hashAlgo, e.creationTimestamp, mSignaturePassphrase);
                     Log.d(Constants.TAG, "e.hashToSign"+ Hex.toHexString(e.hashToSign));
                     return result;
                 }