Use "<Application> Preferences" as generic wxPreferencesEditor dialog title.

This is more appropriate than just "Preferences" under MSW and GTK which use
the generic wxPreferencesEditor, OS X has its own native version which
continues to correctly use "Preferences" for the title.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74007 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/preferences/preferences.cpp

@@ -224,6 +224,11 @@ bool MyApp::OnInit()
     if ( !wxApp::OnInit() )
         return false;
 
+    // This will be used in the title of the preferences dialog under some
+    // platforms, don't leave it as default "Preferences" because this would
+    // result in rather strange "Preferences Preferences" title.
+    SetAppDisplayName("wxWidgets Sample");
+
     MyFrame *frame = new MyFrame();
     frame->Show(true);