Only draw borders if wxSP_3DBORDER specified, as before

Added IsAppThemedEx which _really_ tells you if the app is
themed, and used it in wxRendererNative::GetDefault()


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22432 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/renderer.cpp

@@ -84,7 +84,7 @@ private:
 wxRendererNative& wxRendererNative::GetDefault()
 {
     wxUxThemeEngine *themeEngine = wxUxThemeEngine::Get();
-    return themeEngine && themeEngine->IsThemeActive() ? wxRendererXP::Get()
+    return themeEngine && themeEngine->IsAppThemedEx() ? wxRendererXP::Get()
                                                        : wxRendererMSW::Get();
 }