Column position changes after each delete, so always delete the 0 column.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43428 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/listctrl_mac.cpp

@@ -1556,7 +1556,7 @@ bool wxListCtrl::DeleteAllColumns()
         m_dbImpl->GetColumnCount(&cols);
         for (UInt32 col = 0; col < cols; col++)
         {
-                DeleteColumn(col);
+                DeleteColumn(0);
         }
     }