remove unnecessary kill.

acme.sh

@@ -747,10 +747,6 @@ _stopserver(){
     kill -s 9 $pid > /dev/null
   fi
   
-  for ncid in $(echo $(ps | grep nc) | cut -d " " -f 1) ; do
-    _debug "kill $ncid"
-    kill -s 9 $ncid > /dev/null
-  done
 
   _get "http://localhost:$Le_HTTPPort" >/dev/null 2>&1