message: fixed unconditional signatory creatiom in CreateAccount command
diff: @@ -714,8 +714,9 @@ namespace iroha {
  (
  INSERT INTO signatory(public_key)
  (
  - SELECT :pubkey WHERE EXISTS
  - (SELECT * FROM get_domain_default_role)
  + SELECT :pubkey
  + WHERE EXISTS (SELECT * FROM get_domain_default_role)
  + %s
  )
  ON CONFLICT (public_key)
  DO UPDATE SET public_key = excluded.public_key
  @@ -728,7 +729,6 @@ namespace iroha {
  SELECT :account_id, :domain, 1, '{}'
  WHERE EXISTS (SELECT * FROM insert_signatory)
  AND EXISTS (SELECT * FROM get_domain_default_role)
  - %s
  ) RETURNING (1)
  ),
  insert_account_signatory AS
  