Small wifi reliability enhancements

[brentru]

After talking with @tyeth, we've identified two changes to make to increase wifi reliability:

• For PicoW, there's an issue where it fails to connect to WiFi
  • Within this sample sketch, the WiFi object's setTimeout function is called with a timeout of 20 seconds.
  • We should try this and implement it if it fails less often
• To help find mobile hotspots or other mobile APs, we could increase the number of times WipperSnapper attempts to scan for the wireless network described in secrets.json.

[brentru]

@tyeth Since you can replicate the PicoW bug, do you want to take this issue on (at least the first bullet)?

[brentru]

@tyeth Do we still want to take a look at this, or close it out?

[tyeth]

I still have problems connecting pico-w's, but my local network setup is currently in flux, transitioning to a mesh which brings its own fun/problems.

Think it's worth leaving open, and as you previously said, for me to test with a 20second timeout.