dracut-systemd/dracut-cmdline-ask: fix dracut --kernel-cmdline=rd.cmdline=ask

dracut-systemd/dracut-cmdline-ask: fix dracut --kernel-cmdline=rd.cmdline=ask

How to reproduce:

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

qemu-host# journalctl -b | grep dracut-cmdline-ask
...
Feb 15 08:45:36 localhost systemd[1]: dracut-cmdline-ask.service: Installed new job dracut-cmdline-ask.service/start as 42
Feb 15 08:45:36 localhost systemd[1]: dracut-cmdline-ask.service: ConditionKernelCommandLine=rd.cmdline=ask failed.
Feb 15 08:45:36 localhost systemd[1]: dracut-cmdline-ask.service: Starting requested but condition failed. Not starting unit.
Feb 15 08:45:36 localhost systemd[1]: dracut-cmdline-ask.service: Job dracut-cmdline-ask.service/start finished, result=done
...

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