Enable Tuple pretty test for Roslyn version

DefaultInterpolatedStringHandler is supported since commit f695bbc

ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs

@@ -1,4 +1,4 @@
-// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
 // 
 // Permission is hereby granted, free of charge, to any person obtaining a copy of this
 // software and associated documentation files (the "Software"), to deal in the Software
@@ -560,12 +560,6 @@ namespace ICSharpCode.Decompiler.Tests
 		[Test]
 		public async Task TupleTests([ValueSource(nameof(roslyn2OrNewerOptions))] CompilerOptions cscOptions)
 		{
-			if (cscOptions.HasFlag(CompilerOptions.UseRoslynLatest))
-			{
-				Assert.Ignore("DefaultInterpolatedStringHandler is not yet supported!");
-				return;
-			}
-
 			await RunForLibrary(cscOptions: cscOptions);
 		}