Update papermc.sh

papermc.sh

@@ -44,7 +44,7 @@ exec_stop () {
 
 while true
 	do
-		if [ screen -list | grep -q "mc" ]; then
+		if [  screen -S mc -X select . ; echo $? ]; then
 			trap exec_stop SIGTERM SIGINT
 			sleep 20
 		else