config: use vz as default vm type on macOS 13 or newer (#1217)

Signed-off-by: Abiola Ibrahim <git@abiosoft.com>

environment/vm.go

@@ -64,7 +64,7 @@ func (a Arch) Value() Arch {
 // DefaultVMType returns the default virtual machine type based on the operation
 // system and availability of Qemu.
 func DefaultVMType() string {
-	if util.AssertQemuImg() != nil && util.MacOS13OrNewer() {
+	if util.MacOS13OrNewer() {
 		return "vz"
 	}