Removing a leftover </span> from mod_breadcrumbs

An orphaned `</span>` has been found and returned to the storage for future use.

This </span> wasn't properly removed with https://github.com/joomla/joomla-cms/commit/7edbcf3b137c05c4f3dd27fe2c7ad9c7aa676d49

The span will only show if the "Show 'You are here'" option is enabled.