Fix compilation after r39879

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39885 4005530d-fff6-0310-9dd1-cebe43e6787f
win32: use VisibleIndex in MovePage. Issue 22293

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39886 4005530d-fff6-0310-9dd1-cebe43e6787f