refactor: improve update check message

The code has been refactored to improve the update check message. Instead of displaying the update check interval in seconds, it now displays it in minutes for better readability.

entrypoint-user.sh

@@ -46,7 +46,8 @@ echo -e ""
 echo -e "Starting Update Checks"
 echo -e "================================="
 nohup watch -n "${UPDATE_CHECK}" ./"${GAMESERVER}" update > /dev/null 2>&1 &
-echo -e "update will check every ${UPDATE_CHECK} minutes"
+minutes=$((UPDATE_CHECK / 60))
+echo -e "update will check every ${minutes} minutes"
 
 # Update game server
 if [ -z "${install}" ]; then