Vampire shapeshift and DNA scrambler clear flavourtext on use (#12546)

code/game/gamemodes/vampire/vampire_powers.dm

@@ -247,6 +247,7 @@
 		H.reset_hair() //No more winding up with hairstyles you're not supposed to have, and blowing your cover.
 		H.reset_markings() //...Or markings.
 		H.dna.ResetUIFrom(H)
+		H.flavor_text = ""
 	user.update_icons()
 
 /obj/effect/proc_holder/spell/vampire/self/screech

code/game/objects/items/weapons/dnascrambler.dm

@@ -49,6 +49,7 @@
 		H.reset_hair() //No more winding up with hairstyles you're not supposed to have, and blowing your cover.
 		H.reset_markings() //...Or markings.
 		H.dna.ResetUIFrom(H)
+		H.flavor_text = ""
 	target.update_icons()
 
 	add_attack_logs(user, target, "injected with [src]")