gitweb: Fix search form when PATH_INFO is enabled

Currently that was broken. Ideal fix would make the search form use
PATH_INFO too, but it's just one insignificant place so it's no big deal if
we don't for now... This at least makes it work.

Signed-off-by: Petr Baudis <pasky@suse.cz>
Signed-off-by: Junio C Hamano <junkio@cox.net>

gitweb/gitweb.perl

@@ -408,6 +408,9 @@ (%)
 	my %params = @_;
 	my $href = $my_uri;
 
+	# XXX: Warning: If you touch this, check the search form for updating,
+	# too.
+
 	my @mapping = (
 		project => "p",
 		action => "a",
@@ -1442,6 +1445,7 @@ sub git_header_html {
 		}
 		$cgi->param("a", "search");
 		$cgi->param("h", $search_hash);
+		$cgi->param("p", $project);
 		print $cgi->startform(-method => "get", -action => $my_uri) .
 		      "<div class=\"search\">\n" .
 		      $cgi->hidden(-name => "p") . "\n" .