Well, you're going to have to make it low enough that the line doesn't break. So what I would make it as small as it can get without breaking, and get rid of the right line, so you can't tell that there is extra space leftover.
To do that, open up includes/templates/YOUR_TEMPLATe/common/tpl_drop_menu.php
and replace the entire shopping cart section with this:
<?php if ($_SESSION['cart']->count_contents() != 0) { ?>
<li class="submenu"><a class="noLine" href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>"><?php echo HEADER_TITLE_CART_CONTENTS; ?></a>
<ul class="level2">
<li><a href="<?php echo zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'); ?>"><?php echo HEADER_TITLE_CHECKOUT; ?></a></li>
</ul>
</li>
<?php } else { ?>
<li><a class="noLine" href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>"><?php echo HEADER_TITLE_CART_CONTENTS; ?></a></li>
<?php } ?>
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