DateUtil::formatInterval returned empty string if interval is less than 60 seconds
DateUtil::formatInterval returned empty string if interval is less than 60 seconds

Closes #4632

WoltLab/WCF,SoftCreatR/WCF,WoltLab/WCF,SoftCreatR/WCF,WoltLab/WCF,SoftCreatR/WCF,WoltLab/WCF,SoftCreatR/WCF