Do not check if fully satiated when the item subtracts satiation.

If an item calls with a negative value for satiate when fully satiated hunger_ng will print "You’re fully satiated already!". This change makes it so that it will check if the satiate value is greater or equal to 0 before claiming the player is fully satiated.

hunger_ng.add_hunger_data('foo:foo', { satiate = -5 }