sql_browser: fix unit in server-timing header

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

00:43:28

passed ERP5.PerformanceTest-Master

00:24:43

failed ERP5.UnitTest-Master

01:57:32

failed ERP5.UnitTest-Master.Medusa

01:53:44

passed SlapOS.Eggs.UnitTest-Master.Python2

00:09:17

passed SlapOS.Eggs.UnitTest-Master.Python3

00:34:23

passed SlapOS.Eggs.UnitTest-Master.Python2

00:10:43

passed SlapOS.Eggs.UnitTest-Master.Python3

00:17:21