Baptiste Daroussin 660045fb53 sh: improve emacs mode
In emacs mode, force ^R to backware search the history
This behaviour is the default in emacs mode for most of the other shells

Note: Note that this can still be overridden via $EDITRC, ~/.editrc or a
bind command after set -o emacs.

MFC after:		1 week
Approved by:		jilles
Reviewed by:		jilles, arichardson, pstef
Differential Revision:	https://reviews.freebsd.org/D29494
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