Fix assert due to incorrect format being used in listctrl sample.

"%d" can't be used with long wxListEvent::GetIndex() value in 64 bit builds.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75192 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/listctrl/listtest.cpp

@@ -1305,7 +1305,7 @@ void MyListCtrl::OnRightClick(wxMouseEvent& event)
 
 void MyListCtrl::LogEvent(const wxListEvent& event, const wxChar *eventName)
 {
-    wxLogMessage(wxT("Item %d: %s (item text = %s, data = %ld)"),
+    wxLogMessage(wxT("Item %ld: %s (item text = %s, data = %ld)"),
                  event.GetIndex(), eventName,
                  event.GetText(), static_cast<long>(event.GetData()));
 }