fish vi-mode: Place 'enter' binding in common definitions
fish vi-mode: Place 'enter' binding in common definitions

Fixes enter not working in overwrite mode.

Signed-off-by: Ian Munsie <ce389fd2fa887d610219cb85dea6dc9451973e74@gmail.com>

DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk,DarkStarSword/junk