Update papermc.sh

fixed some more stupid mistakes

papermc.sh

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