Try harder to display node hashes in tags view in monospaced font.
Used to work around Firefox's behaviour if "Allow pages to choose their
own fonts" is disabled.
<item>
<title>#tag|escape#</title>
<link>#url#?cs=#node|short#</link>
<description><![CDATA[#tag|strip|escape|addbreaks#]]></description>
<pubDate>#date|rfc822date#</pubDate>
</item>