fixes a typo (#1265)

Author: IndusRobot

code/datums/weather/weather_types/radiation_storm.dm

@@ -33,7 +33,7 @@
 	if(prob(40))
 		if(ishuman(L))
 			var/mob/living/carbon/human/H = L
-			if(H.dna && !(HAS_TRAIT(H, TRAIT_MUTATEIMMUNE) || HAS_TRAIT(H, TRAIT_MUTATEIMMUNE))) // NSV13 Don't add mutations for species that are trait immune, IPCs
+			if(H.dna && !(HAS_TRAIT(H, TRAIT_RADIMMUNE) || HAS_TRAIT(H, TRAIT_MUTATEIMMUNE))) // NSV13 Don't add mutations for species that are trait immune, IPCs
 				if(prob(max(0,100-resist)))
 					H.randmuti()
 					if(prob(50))