Fix "kvm: Increase default VM parameters to match nowadays requirement"

There was missing change in the default value to calculate default maximum
amount of parameters.

This fixes commit 2e6ccd02.
7 jobs for 1.0 in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:10:29

passed SlapOS.Eggs.UnitTest-Master.Python3

00:34:04

failed SlapOS.SlapRunner.ResilienceTest-Master

00:05:59

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:39:00

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

05:09:45

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

05:59:44

failed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

13:20:44