fix minimal_test example to work with modshogun

examples/undocumented/csharp_modular/minimal_test.cs

@@ -4,7 +4,7 @@ public class HelloWorld
 {
 	public static void Main(string[] args)
 	{
-		Library.init_shogun_with_defaults();
+		modshogun.init_shogun_with_defaults();
 		GaussianKernel k = new GaussianKernel();
 		Console.WriteLine(k.get_width());
 	}