base/init.sh: don't remove 99-cmdline-ask on 'hostonly' cleanup

base/init.sh: don't remove 99-cmdline-ask on 'hostonly' cleanup

How to reproduce:
host# ./dracut.sh -o 'dracut-systemd systemd systemd-initrd' --local -f ./initramfs.img

host# qemu-system-x86_64 -initrd ./initramfs.img \
    -append 'root=/dev/sda1 rd.cmdline=ask rd.hostonly=0' \
    ...

Enter additional kernel command line parameter (end with ctrl-d or .)
> rd.break
> .
...
There is no "Break before switch_root"
...

Signed-off-by: Evgeny Vereshchagin <evvers@ya.ru>