message: Fix a nit in the recovery tests
  Summary: This is a backport of libsecp256k1 PR657
  Test Plan:
  ninja check-secp256k1
  Reviewers: #bitcoin_abc, nakihito
diff: @@ -214,7 +214,7 @@ void test_ecdsa_recovery_edge_cases(void) {
  };
  const unsigned char sig64[64] = {
  /* Generated by signing the above message with nonce 'This is the nonce we will use...'
  - * and secret key 0 (which is not valid), resulting in recid 0. */
  + * and secret key 0 (which is not valid), resulting in recid 1. */
  0x67, 0xCB, 0x28, 0x5F, 0x9C, 0xD1, 0x94, 0xE8,
  0x40, 0xD6, 0x29, 0x39, 0x7A, 0xF5, 0x56, 0x96,
  0x62, 0xFD, 0xE4, 0x46, 0x49, 0x99, 0x59, 0x63,
  