Bugfix: Only delete spool files that are spool files
Bugfix: Only delete spool files that are spool files

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