fix minimum required space for data directory
fix minimum required space for data directory

patricklodder/dogecoin,patricklodder/dogecoin,dogecoin/dogecoin,patricklodder/dogecoin,dogecoin/dogecoin,dogecoin/dogecoin,dogecoin/dogecoin,patricklodder/dogecoin,dogecoin/dogecoin,patricklodder/dogecoin,dogecoin/dogecoin