synopsis.xsl: fix broken translation builds

This commit is a follow up of r1805189, in which
a new logic was added to allow to repeat a directive
name only if its type is different (like SSLPolicy
and <SSLPolicy>). The change broken french translations
since the $this variable, containing the translated
sections, was not used anymore.

The XPath code could surely be improved, but it seems
more pressing to allow our translators to get back
to their daily work without interference.

build.sh validate-* worked fine, as well as the build.sh fr
translation.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1806443 13f79535-47bb-0310-9956-ffa450edef68