Plasmaman no dna theft trait addition (#77021)

Fixes: #76972

- adds no dna stealing sting trait to plasmamen

Plasmaman can't get stung and turn others into plasmamens.

:cl:
fix: Plasmaman DNA can no longer be stolen by changelings.
/:cl:

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

@@ -14,6 +14,8 @@
 		TRAIT_RADIMMUNE,
 		TRAIT_RESISTCOLD,
 		TRAIT_NOBLOOD,
+		TRAIT_NO_DNA_COPY,
+		TRAIT_NO_TRANSFORMATION_STING,
 	)
 
 	inherent_biotypes = MOB_HUMANOID|MOB_MINERAL