route-update.sh: filter comments from gateway display

router/route-update.sh

@@ -292,7 +292,7 @@ process_routes()
         fi
 
         local count=$(wc -l < "$resolved_new")
-        local gw_display=$(paste -sd, < "$gwdir/gateway")
+        local gw_display=$(grep -v '^#' "$gwdir/gateway" | grep . | paste -sd,)
         log "[$name]$label Loading $count routes into table $table via $gw_display"
 
         if [ -n "$SHOW" ] ; then