C#: Temporarily comment out considering Enums as having a sanitizing effect.

csharp/ql/lib/semmle/code/csharp/security/Sanitizers.qll

@@ -57,8 +57,8 @@ class SimpleTypeSanitizedExpr extends DataFlow::ExprNode {
   SimpleTypeSanitizedExpr() {
     exists(Type t | t = this.getType() or t = this.getType().(NullableType).getUnderlyingType() |
       t instanceof SimpleType or
-      t instanceof SystemDateTimeStruct or 
-      t instanceof Enum
+      t instanceof SystemDateTimeStruct
+      // or t instanceof Enum
     )
   }
 }