packer: unset bogus shutdown_command

packer/hcl2/source-qemu.pkr.hcl

@@ -10,5 +10,4 @@ source "qemu" "x86_64" {
   ssh_password = "void"
   ssh_timeout = "20m"
   ssh_username = "void"
-  shutdown_command = "echo 'void' | sudo -S shutdown -P now"
 }

packer/scripts/cloud.sh

@@ -24,3 +24,5 @@ passwd -dl void
 passwd -dl root
 
 rm -rf /var/cache/xbps
+
+shutdown -P now