Restored drag position mysteriously removed in revision 1.233

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@44363 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/treectrl.cpp

@@ -2224,6 +2224,7 @@ WXLRESULT wxTreeCtrl::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lPara
 
                     // generate the drag end event
                     wxTreeEvent event(wxEVT_COMMAND_TREE_END_DRAG, this, htItem);
+                    event.m_pointDrag = wxPoint(x, y);
                     (void)GetEventHandler()->ProcessEvent(event);
 
                     // if we don't do it, the tree seems to think that 2 items