jvcl: Fix crash of TJvDBTreeView when deleting the last child of a node. Issue #45 reported at sourceforge.

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@7692 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/jvcllaz/run/JvDB/jvdbtreeview.pas

@@ -980,7 +980,7 @@ begin
         {*** To delete from a tree the remote/removed records [translated] }
         repeat
           AllChecked := True;
-          for I := 0 to Items.Count - 1 do
+          for I := Items.Count - 1 downto 0 do
             if not Locate(FMasterField, (Items[I] as TJvDBTreeNode).FMasterValue, []) then
             begin
               Items[I].Free;