fix: update cloud-init var in ansible provisioner

builds/linux/centos/9-stream/linux-centos-stream.pkr.hcl

@@ -199,7 +199,7 @@ build {
       "--extra-vars", "build_key='${var.build_key}'",
       "--extra-vars", "ansible_username=${var.ansible_username}",
       "--extra-vars", "ansible_key='${var.ansible_key}'",
-      "--extra-vars", "enable_cloud_init='${var.vm_cloudinit}'",
+      "--extra-vars", "enable_cloudinit='${var.vm_cloudinit}'",
     ]
   }