kvm: Assume proper type for booleans

Thanks to migration to json-in-xml serialisation some lower level bugs has
been discovered with value types in the profiles, so simply fix it.
1 job for feature/kvm-move-to-json-in-xml
Status Job ID Name Coverage
  External
running SlapOS.SoftwareReleases.IntegrationTest-py3-luke/feature/kvm-move-to-json-in-xml

22119:39:37