Remove call to EnableInternalPdfViewerOffScreen as it's been removed as Chromium no longer supports disabling of surfaces

CefSharp.MinimalExample.Wpf/App.xaml.cs

@@ -9,7 +9,6 @@ namespace CefSharp.MinimalExample.Wpf
         {
             //Perform dependency check to make sure all relevant resources are in our output directory.
             var settings = new CefSettings();
-            settings.EnableInternalPdfViewerOffScreen();
 
             Cef.Initialize(settings, performDependencyCheck: true, browserProcessHandler: null);
         }