Remove default runlevel from VM kernel parameters

Runlevels are not used anymore with systemd (it uses target concept).
Remove the parameter as it causes problems with archlinux template.

xen-vm-config/vm-template.conf

@@ -5,7 +5,7 @@
 
 kernel="{kerneldir}/vmlinuz"
 ramdisk="{kerneldir}/initramfs"
-extra="ro nomodeset console=hvc0 rd_NO_PLYMOUTH 3 {kernelopts}"
+extra="ro nomodeset console=hvc0 rd_NO_PLYMOUTH {kernelopts}"
 root="/dev/mapper/dmroot"
 tsc_mode = 2