Fix hexword entry without leading hash

Fixes the bit where you insert ``FAECE5`` and the code still thinks you have a ``#`` in front of it.

The ``#?`` says it's optional, but it's still ``substr()``-ed.
![Yaaay!](http://fc08.deviantart.net/fs70/f/2010/052/c/3/FRIENDS_gif_animation_14_by_NINO16.gif)