Fix missing SQL group by in ping
Fix missing SQL group by in ping

https://github.com/friendica/friendica/issues/3322

fabrixxm/friendica,friendica/friendica,friendica/friendica,tobiasd/friendica,annando/friendica,tobiasd/friendica,fabrixxm/friendica,friendica/friendica,annando/friendica,friendica/friendica,fabrixxm/friendica,tobiasd/friendica,annando/friendica,annando/friendica,fabrixxm/friendica,tobiasd/friendica,fabrixxm/friendica,friendica/friendica,tobiasd/friendica,annando/friendica