unify font size of both sortable and non-sortable columns in table header.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@22974 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/erp5.css.xml

@@ -444,7 +444,6 @@ button.sort_button {\n
 button.sort_button span {\n
   color: inherit;\n
   text-decoration: underline;\n
-  font-size: 90%;\n
 }\n
 \n
 img {\n

product/ERP5/bootstrap/erp5_xhtml_style/bt/revision

-582
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+583
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