Fixes Chemthrower Fire Burning Mobs That Don't Care About Fire (#31316)

* fire

* Update fire_effect.dm

code/game/objects/items/weapons/chemical_flamethrower/fire_effect.dm

@@ -115,8 +115,9 @@ GLOBAL_LIST_EMPTY(flame_effects)
 	merging_flame.fizzle()
 
 /obj/effect/fire/proc/damage_mob(mob/living/mob_to_burn)
-	if(!istype(mob_to_burn))
+	if(!istype(mob_to_burn) || HAS_TRAIT(mob_to_burn, TRAIT_RESISTHEAT))
 		return
+
 	var/fire_damage = temperature / 100
 	if(ishuman(mob_to_burn))
 		var/mob/living/carbon/human/human_to_burn = mob_to_burn

code/modules/mob/living/silicon/silicon_mob.dm

@@ -5,6 +5,7 @@
 	weather_immunities = list("ash")
 	mob_biotypes = MOB_ROBOTIC
 	flags_2 = RAD_PROTECT_CONTENTS_2 | RAD_NO_CONTAMINATE_2
+	initial_traits = list(TRAIT_RESISTHEAT)
 
 	// You can define armor as a list in datum definition (e.g. `armor = list("fire" = 80, "brute" = 10)`),
 	// which would be converted to armor datum during initialization.