fix parameter name

lib/IdPAccountManager/WebRequest.pm

@@ -473,7 +473,7 @@ sub req_validate_token {
         );
         next unless $account;
         next unless $account->save(
-            account_validity_period => $self->{configuration}->{account_validity_period}
+            accounts_validity_period => $self->{configuration}->{accounts_validity_period}
         );
         push @accounts, $account;
     }