Fix socket accept flow and timeout code

[us3r64]

• httpserver is checking OSError code for timeout: https://github.com/adafruit/Adafruit_CircuitPython_HTTPServer/blob/main/adafruit_httpserver/server.py#L274 so timeout should set ETIMEDOUT

• socket accept should handle status SNSR_SOCK_LISTEN and SNSR_SOCK_CLOSE_WAIT

#153