slapos.cookbook: remove uneeded zip_binary in erp5testnode recipe

See erp5!1931
18 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:13:06

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:47:33

failed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

15:01:56

passed SlapOS.Eggs.UnitTest-Master.Python2

00:18:09

passed SlapOS.Eggs.UnitTest-Master.Python3

00:16:47

passed SlapOS.Eggs.UnitTest-Master.Python3Next

00:17:00

failed SlapOS.SoftwareReleases.IntegrationTest-Master

07:34:07

failed SlapOS.Theia.ResilienceTest-Master-ERP5

07:00:12

failed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

15:02:34

failed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

15:01:44

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:28:33

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:33:51

passed SlapOS.Eggs.UnitTest-Master.Python2

00:14:34

passed SlapOS.Eggs.UnitTest-Master.Python3

00:24:29

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:45:30

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:35:34

failed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

15:01:43

failed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

15:02:24