ecc: Default cofactor 1 for PUBKEY_FLAG_PARAM.
* cipher/ecc.c (ecc_check_secret_key, ecc_sign, ecc_verify) (ecc_encrypt_raw, ecc_decrypt_raw, compute_keygrip): Set default cofactor as 1, when not specified.
- GnuPG-bug-id: T2347
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>