Fix for negative hand encumb

[01:14]	ZChris13	I have -1 enc on my hands right now
[01:16]	veryinky	Does that do anything?
[01:16]	ZChris13	probably?
[01:16]	ZChris13	Dexterity --1 when throwing items
[01:17]	ZChris13	reloading costs +-30 movement points
Fix makes it so hand enc goes to 0 if it's -1 or less.