Auction fields fail when user preview auction

Hi.

When user use preview button in auction/product_node_form field values aren't remembered.

The fix for Expiration date & time in uc_auction.module on line 140, other fields should have similar solutions:

         if ($form_state['values']['expiry']) {
          	$expiry = strtotime($form_state['values']['expiry']);
          } else {
          	$expiry = time() + 604800;
          }

instead of

$expiry = time() + 604800;