Unused usings

Source commit: 1ba1acc3534709555be956e6209f59780ede0f33

dotnet/ComparisonDifference.cs

@@ -1,7 +1,5 @@
 using System;
-using System.Globalization;
 using System.Runtime.InteropServices;
-using WinSCP;
 
 namespace WinSCP
 {