restored custom drawing (was accidentally disabled by the last 2 commits)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22548 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/listctrl.cpp

@@ -2066,6 +2066,7 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
                 break;
 
 #ifdef NM_CUSTOMDRAW
+            case NM_CUSTOMDRAW:
                 *result = OnCustomDraw(lParam);
 
                 return TRUE;