Fix "caddy-frontend: Move out logic from configuration file generation"

default-path has been set twice by mistake, so remove one of the sets.

Fixes commit fc23be53
10 jobs for 1.0
Status Job ID Name Coverage
  External
passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

passed ERP5.StandaloneDeploymentScriptTest-Debian.Stretch

passed SlapOS-Master.StandaloneDeploymentScriptTest-Debian.Buster

passed SlapOS-Master.StandaloneDeploymentScriptTest-Debian.Stretch

passed SlapOS.KVM.ResilienceTest-Master

passed SlapOS.SlapRunner.ResilienceTest-Master

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

failed SlapOS.SoftwareReleases.IntegrationTest-Master

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Stretch