Bugfix #817: Dead NPCs and Creatures still have collision boxes

I couldn't just get rid of the collision boxes since they're required for looting items. I couldn't rotate/reposition them, since that wouldn't work well with all creatures. 

I figured the most straightforward way to go about handling this would be to scale down the collision boxes. The main issue here is that you have a much smaller box to click on when you want to loot a corpse. It doesn't seem _too_ problematic, though (I tested it on mudcrabs)

If there is a better way, let me know and I'll fix it. I'm still not all too familiar with this codebase.