Fixes a bug that allowed turret guns to be fired by mobs. (#20451)

* TRIGGER_GUARD_NONE works properly

* uses FALSE instead of 0

code/game/gamemodes/wizard/rightandwrong.dm

@@ -29,7 +29,6 @@ GLOBAL_LIST_INIT(summoned_guns, list(
 	/obj/item/gun/projectile/automatic/l6_saw,
 	/obj/item/gun/projectile/automatic/m90,
 	/obj/item/gun/energy/alien,
-	/obj/item/gun/energy/gun/turret,
 	/obj/item/gun/energy/pulse/carbine,
 	/obj/item/gun/energy/decloner,
 	/obj/item/gun/energy/mindflayer,

code/modules/mob/living/living.dm

@@ -1032,7 +1032,10 @@
 /mob/living/proc/can_use_guns(obj/item/gun/G)
 	if(G.trigger_guard != TRIGGER_GUARD_ALLOW_ALL && !IsAdvancedToolUser() && !issmall(src))
 		to_chat(src, "<span class='warning'>You don't have the dexterity to do this!</span>")
-		return 0
+		return FALSE
+	if(G.trigger_guard == TRIGGER_GUARD_NONE)
+		to_chat(src, "<span class='warning'>This gun is only built to be fired by machines!</span>")
+		return FALSE
 	return 1
 
 /mob/living/start_pulling(atom/movable/AM, state, force = pull_force, show_message = FALSE)