fix(xapi/VM_checkpoint): set is_a_template to false
fix(xapi/VM_checkpoint): set is_a_template to false

The work-around was already implement for `VM_snapshot`.

lmcro/xo-web,lmcro/xo-web,lmcro/xo-web,vatesfr/xo-web,vatesfr/xo-web