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.

default = "changelog"
header = header-rss.tmpl
changelog = changelog-rss.tmpl
changelogentry = changelogentry-rss.tmpl
filelog = filelog-rss.tmpl
filelogentry = filelogentry-rss.tmpl