fff-web: UPGRADE_PATH in header should be taken from hood file

Signed-off-by: Tim Niemeyer <tim@tn-x.org>
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Christian Dresel <fff@chrisi01.de>

src/packages/fff/fff-web/files/www/ssl/cgi-bin/header

 #!/usr/bin/haserl
 
 <%
-. /etc/community.cfg
+. /lib/functions/fff/keyxchange
 . /etc/firmware_release
+
+UPGRADE_PATH="$(getUpgradePath)"
+
 echo -en "Content-Type: text/html\r\n\r\n"
 nav_entry() {
 	script_file="/cgi-bin/$1"