test_result: remove debug shell links

This stopped working long time ago, probably with slapos commit aa102f28f
(erp5testnode: use newer shellinabox, with a caddy frontend, 2018-09-21)
7 jobs for fix/edit_action in 0 seconds (queued for 1 second)
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

00:48:20

passed ERP5.UnitTest-Master

01:33:47

failed ERP5.UnitTest-Master.Medusa

01:38:19

passed SlapOS.Eggs.UnitTest-Master.Python2

00:09:32

passed SlapOS.Eggs.UnitTest-Master.Python3

00:10:29

passed SlapOS.Eggs.UnitTest-Master.Python2

00:10:16

passed SlapOS.Eggs.UnitTest-Master.Python3

00:12:50