remove out-of-place TN in Skills

traits.tex

@@ -763,7 +763,7 @@ It is practised by guards or the eternally paranoid.
     to collect clues in a crime-scene.
   \item[\roll{Wits}{Vigilance}]
     to notice imminent danger.
-  \item[\roll{Charisma}{Vigilance}] (\tn[14])
+  \item[\roll{Charisma}{Vigilance}]
     investigating a rumour.
 \end{description}