Fix devour nutrient calculations (#3300)

changes:

Devour no longer gives unathi ridiculous amounts of protein.
Xenomorph devour actually works now I swear

code/modules/mob/living/carbon/human/human.dm

@@ -11,8 +11,6 @@
 	mob_size = 9//Based on average weight of a human
 
 /mob/living/carbon/human/Initialize(mapload, var/new_species = null)
-	eat_types |= TYPE_ORGANIC//Any mobs that are given the devour verb, can eat nonhumanoid organics. Only applies to unathi for now
-
 	if(!dna)
 		dna = new /datum/dna(null)
 		// Species name is handled by set_species()

code/modules/mob/living/carbon/human/species/species.dm

@@ -145,6 +145,7 @@
 
 	var/gluttonous                // Can eat some mobs. Boolean.
 	var/mouth_size                // How big the mob's mouth is. Limits how large a mob this species can swallow. Only relevant if gluttonous is TRUE.
+	var/allowed_eat_types = TYPE_ORGANIC
 	var/max_nutrition_factor = 1	//Multiplier on maximum nutrition
 	var/nutrition_loss_factor = 1	//Multiplier on passive nutrition losses
 
@@ -329,6 +330,7 @@
 	H.pass_flags = pass_flags
 	H.mob_size = mob_size
 	H.mouth_size = mouth_size || 2
+	H.eat_types = allowed_eat_types
 	if(!kpg)
 		if(islesserform(H))
 			H.dna.SetSEState(MONKEYBLOCK,1)

code/modules/mob/living/carbon/human/species/xenomorphs/alien_species.dm

@@ -13,6 +13,7 @@
 	siemens_coefficient = 0
 	gluttonous = TRUE
 	mouth_size = 15	// Should be larger than any human-type.
+	allowed_eat_types = TYPE_ORGANIC | TYPE_SYNTHETIC | TYPE_HUMANOID
 	mob_size = 14
 	fall_mod = 0
 

code/modules/mob/living/devour.dm

@@ -181,7 +181,7 @@
 			M.adjustBruteLoss(round(dmg_factor * 0.33, 0.1) || 0.1)
 			M.adjustFireLoss(round(dmg_factor * 0.66, 0.1) || 0.1)
 
-			ingested.add_reagent(M.composition_reagent, M.composition_reagent_quantity * 1/dmg_factor)
+			ingested.add_reagent(M.composition_reagent, M.composition_reagent_quantity * dmg_factor)
 
 			if (M.stat == DEAD && !stomach_contents[M])	// If the mob has died, poke the consuming mob about it.
 				src << "Your stomach feels a little more relaxed as \the [M] finally stops fighting."