fix https://github.com/Neilpang/acme.sh/issues/1193#issuecomment-360025170

acme.sh

@@ -2724,7 +2724,7 @@ _isRealNginxConf() {
         _debug "_seg_n" "$_seg_n"
 
         _skip_ssl=1
-        for _listen_i in $(echo "$_seg_n" | grep "^ *listen" | tr -d " "); do
+        for _listen_i in $(echo "$_seg_n" | tr "\t" ' ' | grep "^ *listen" | tr -d " "); do
           if [ "$_listen_i" ]; then
             if [ "$(echo "$_listen_i" | _egrep_o "listen.*ssl[ |;]")" ]; then
               _debug2 "$_listen_i is ssl"