hgweb: a couple of fixes on search page
- show search string in the bottom search box
- wrap search boxes within paragraphs, this also puts
some space between last changeset and bottom
search box in firefox.
<item>
<title>#desc|firstline|escape#</title>
<link>#url#?cs=#node|short#</link>
<description><![CDATA[#desc|escape|addbreaks#]]></description>
<author>#author|obfuscate#</author>
<pubDate>#date|rfc822date#</pubDate>
</item>