Document: Add member name to pdf viewer window title

Elwig/Documents/Document.cshtml.cs

@@ -134,7 +134,7 @@ namespace Elwig.Documents {
 
         public void Show() {
             if (_pdfFile == null) throw new InvalidOperationException("Pdf file has not been generated yet");
-            Pdf.Show(_pdfFile.NewReference(), Title);
+            Pdf.Show(_pdfFile.NewReference(), Title + (this is BusinessDocument b ? $" - {b.Member.Name}" : ""));
         }
 
         private class InternalDocument : Document {