Always make first entry of buther prompt match the butcher action hotkey.

Slight oversight, there was some code that made the first corpse listed for butchery use B as the hotkey so you could just hold down 'B' (or whatever the right hotkey is) and butcher the whole pile, and it wasn't updated to include items.  With this little tweak it applies, so you can disassemble all the things with great speed.