register current web site physical path for later URL generation in WebSection.__call__() too, otherwise it is not set in accessing web site root, and it's default document's absolute_url() value is 'http://host/erp5/web_page_module/page_id' instead of 'http://host/erp5/web_site_module/site_id/web_page_module/page_id'


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27163 20353a03-c40f-0410-a6d1-a30d3c3de9de