Fix TypeError on recv

[brentru]

• Fixes TypeError message thrown by recv() reading a specific amount of bytes, useful for applications which require socket to receive a specific amount of bytes (protocol implementations, like MQTT):

from (typeerror):

Traceback (most recent call last):
  File "code.py", line 74, in <module>
  File "/lib/adafruit_minimqtt.py", line 304, in connect
  File "/lib/adafruit_minimqtt.py", line 621, in _wait_for_msg
  File "/lib/adafruit_wiznet5k/adafruit_wiznet5k_socket.py", line 210, in recv
TypeError: join expects a list of str/bytes objects consistent with self object

to:

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Connecting to Adafruit IO...
Connected to Adafruit IO! Listening for topic changes on brubell/feeds/onoff
Sending photocell value: 0...

• Sets socket timeout to a default timeout