mail: Change default value of auto download message size

        const val DEFAULT_STRIP_SIGNATURE = true

        const val DEFAULT_REMOTE_SEARCH_NUM_RESULTS = 25

        const val DEFAULT_RINGTONE_URI = "content://settings/system/notification_sound"

        const val DEFAULT_MAXIMUM_AUTO_DOWNLOAD_MESSAGE_SIZE = 1048576

        const val DEFAULT_MAXIMUM_AUTO_DOWNLOAD_MESSAGE_SIZE = 2097152

    }

}