Undead was not ever actually draw_update()ing to the edges of its

Undead was not ever actually draw_update()ing to the edges of its
rectangle, which showed up on the Javascript front end since the JS
canvas doesn't start out defaulting to COL_BACKGROUND. Fixed it to
draw_update to the edge of its area, and while I'm at it, narrowed the
border (since this proves we didn't really need that much space
anyway).

[originally from svn r9795]