use CmdDown() instead of #ifdefs for Mac

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28119 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/listctrl.cpp

@@ -2981,12 +2981,7 @@ void wxListMainWindow::OnMouse( wxMouseEvent &event )
         m_lineLastClicked = current;
 
         size_t oldCurrent = m_current;
-        bool cmdModifierDown;
+        bool cmdModifierDown = event.CmdDown();
-#ifdef __WXMAC__
-        cmdModifierDown = event.MetaDown();
-#else
-        cmdModifierDown = event.ControlDown();
-#endif
         if ( IsSingleSel() || !(cmdModifierDown || event.ShiftDown()) )
         {
             HighlightAll( false );