[readline] fix adding of "less" for command

To fix that bind the sequence to something other than Control-J and use
that keystroke to add the less and carriage return to commands that you
want.
The reason for this problem is that Control-J is normally bound
to accept-line as is Control-M (enter).

More info here:
http://serverfault.com/questions/31845/is-there-a-way-to-configure-bash-to-always-page-output/31870?noredirect=1#comment564386_31870