Fix out of date package

Created by: DomThePorcupine

As written here: https://www.archlinux.org/packages/community/x86_64/virtualbox-host-dkms/ virttualbox-host-modules has been replaced by virtualbox-host-dkms. Although we advocate using QEMU and bootstrap installs QEMU regardless, so I am not sure if we should even be installing virtualbox here. Just my thoughts either way this dependency is now fixed.