Remove unused comment

E2ETest/RejectSubmissionTest.cs

@@ -12,7 +12,6 @@ public class RejectSubmissionTest : EndToEndTestBase {
     [Order(10)]
     [Test]
     public void SendingSubmission() {
-        // TODO - weaker test for signature validation certificates
         var submission = Sender.WithDestination(Settings.DestinationId)
             .WithServiceType("Straight forward test", Settings.LeikaKey)
             .WithAttachments(new Attachment("Test.pdf", "A simple PDF"))