Update PicoW_CircuitPython_HTTP_Server for new adafruit_httpserver li…

[anecdata]

…brary version 2.0.0

Tested the edited routes on Adafruit CircuitPython 8.0.0-beta.6 on 2022-12-21; Raspberry Pi Pico W with rp2040, but without the static ipconfig, outputs, and displayio.

[anecdata]

Edited test code here.

code.py output:
Connected to WiFi
starting server..
Listening on http://192.168.6.198:80
POST / HTTP/1.1
Host: 192.168.6.198
Origin: http://192.168.6.198
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Safari/605.1.15
Referer: http://192.168.6.198/
Content-Length: 9
Accept-Language: en-US,en;q=0.9

LED+ON=ON
POST / HTTP/1.1
Host: 192.168.6.198
Origin: http://192.168.6.198
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Safari/605.1.15
Referer: http://192.168.6.198/
Content-Length: 11
Accept-Language: en-US,en;q=0.9

LED+OFF=OFF
POST / HTTP/1.1
Host: 192.168.6.198
Origin: http://192.168.6.198
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Safari/605.1.15
Referer: http://192.168.6.198/
Content-Length: 11
Accept-Language: en-US,en;q=0.9

party=party
connected
connected
connected

[dhalbert]

Full test with all the hardware. Found one existing bug (not from this PR): temp_test was already a string, so on the 30 second cycle, it would raise (and discard) an exception due to the %d in the format string. Changed to %s.

Thanks @anecdata!