Undo accidental change to the notebook sample.

This debugging/testing change was accidentally committed as part of r78462.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78464 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/notebook/notebook.cpp

@@ -884,7 +884,6 @@ void MyFrame::OnDeleteLastPage(wxCommandEvent& WXUNUSED(event))
 
 void MyFrame::OnNextPage(wxCommandEvent& WXUNUSED(event))
 {
-    wxFindWindowAtPoint(wxPoint(0,0));
     wxBookCtrlBase *currBook = GetCurrentBook();
 
     if ( currBook )