Refactor to remove redundant empty class body

Co-authored-by: Mauro Servienti <[email protected]>

Author: hsvotwa

samples/logging/extensions-logging/Extensions.Logging_4/Sample/MyMessage.cs

@@ -1,6 +1,3 @@
 using NServiceBus;
 
-public class MyMessage :
-    IMessage
-{
-}
+public class MyMessage : IMessage;

samples/logging/extensions-logging/Extensions.Logging_4/Sample/Program.cs

@@ -48,8 +48,7 @@
 
 var endpointInstance = host.Services.GetRequiredService<IMessageSession>();
 
-var myMessage = new MyMessage();
-await endpointInstance.SendLocal(myMessage);
+await endpointInstance.SendLocal(new MyMessage());
 
 Console.WriteLine("Press any key to exit");
 Console.ReadKey();