make IPv6-Check independent of IPv6-Prefix

ffs-watchdog/files/usr/sbin/ffs-watchdog

@@ -11,7 +11,7 @@ if [ "$(uci get gluon-setup-mode.@setup_mode[0].enabled)" = "0" ] &&
    [ "$(netstat -nt | grep -c ':22')" = "0" ]; then
 
   if [ -n "$(batctl gwl | grep '=>')" ] &&
-     [ -n "$(ifconfig br-client | grep 'fd21:b4dc:4b')" ]; then
+     [ $(ifconfig br-client | grep -c "inet6 addr:") -gt 2 ]; then
     echo 0 >$FFS
     logger -t $ME "node is online"
   else