caddy-frontend: Fix profile issue

The "30" was not removed by mistake, which lead to activity timeout being 30,
instead of configured one.
5 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:22:50

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

06:40:18

passed SlapOS.SlapRunner.ResilienceTest-Master

00:22:16

passed SlapOS.SlapRunner.ResilienceTest-Master

00:21:35

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:13:18