fix max open file descriptors in woezel
fix max open file descriptors in woezel

use 'with open(...) as f:' instead of 'f = open(...)'

SHA2017-badge/micropython-esp32,SHA2017-badge/micropython-esp32,SHA2017-badge/micropython-esp32,SHA2017-badge/micropython-esp32,SHA2017-badge/micropython-esp32