set resume parameter for vm_start_nolock if there is a vmstate

set resume parameter for vm_start_nolock if there is a vmstate

In config_to_command, '-loadstate' will be added whenever there is a
vmstate in the config. But in vm_start_nolock, the resume parameter
is used to calculate the appropriate timeout and to remove the vmstate
after the start. The resume parameter was only set if there is a
'suspended' lock, but apparently [0] we cannot rely on the lock to be
set if and only if there is a vmstate.

[0]: https://forum.proxmox.com/threads/task-error-start-failed.72450

Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>