TrashTool: avoid unnecessary function parameter expansion

5 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

01:43:04

passed ERP5.PerformanceTest-Master

00:23:05

failed ERP5.UnitTest-Master.Medusa

03:20:41

passed SlapOS.Eggs.UnitTest-Master.Python2

00:19:30

passed SlapOS.Eggs.UnitTest-Master.Python3

00:19:01