Revert toram bootoption to expected behaviour.

Revert toram bootoption to expected behaviour.

In commit 36bb11382c81d5bce4b69f6d3d618dfd1c38dffb
of live-initramfs-grml (when merging Debian's version 1.157.4-1)
the behaviour of toram bootoption was modified, see
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534878

On Grml we want to have the option to load the whole medium
into RAM to e.g. have additional directories like /deb,
/scripts or whatever. This is possible using the toram bootoption
without any additional arguments.

If you do NOT want to load the whole medium to RAM just
boot using toram=grml.squashfs (or whatever it's named,
there's a ready-to-use bootoption in Grml's bootsplash
menu available) instead.

Ammusingly the requested behaviour is available in Debian's
live-boot if rsync is not available, so this patch
actually just unifies the code paths and reverts the
behaviour change back to what the log message says.