MAINT: Apply pre-commit

Remove byte-order-marker pre-commit check as there would be
many adjustments necessary

15_Boxing/csharp/Boxer.cs

@@ -42,4 +42,4 @@ public class Opponent : Boxer
             Vulnerability = (Punch) GameUtils.Roll(4); // D1
         } while (BestPunch == Vulnerability);
     }
-}
+}