fix check if machine type is q35

fix check if machine type is q35

When live migrating, with a q35 machine will get the qemu version
encoded in the machine type, for example,'pc-q35-2.12', so we need to
allow this too and cannot expect that all q35 machine have
q35' in verbatim as their type.

So, when migrating such a machine live, we missed to include the q35
cfg because we didn't allowed versioned q35 machine types, which then
failed the migration.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>