fix segment naming

ffs-set-segment/files/usr/sbin/ffs-set-segment

@@ -41,7 +41,7 @@ do
   OLDPEER=$(uci get fastd.mesh_vpn_backbone_peer_${GW}.remote)
   OLDDOMAIN=$(uci get gluon.core.domain)
   NEWPEER=$(printf "\"gw%02ds%02d.gw.freifunk-stuttgart.de\" port %d" $i $GITSEG $PORT)
-  NEWDOMAIN=$(printf "\"ffs-seg%02d\"" $GITSEG)
+  NEWDOMAIN=$(printf "\"ffs_seg%02d\"" $GITSEG)
   if [ "$NEWPEER" != "$OLDPEER" ]; then
   if [ "$NEWDOMAIN" != "$OLDDOMAIN" ]; then
     uci set gluon.core.domain="$NEWDOMAIN"