Switch to Pico footprint without castellated test point connections

[cdwilson]

The Rev 1 board has an experimental footprint which provides hand-solder access to the test point pads on the bottom of the Pico boards.

I didn't realize that the TP4/TP5/TP6 test points on the Pico W are placed in a different location vs. the test points on the Pico or Pico 2, so the Pico W is not compatible with the Rev 1 board.

On the next rev, this footprint should be changed to a standard footprint which does not use these castellated test points.

[cdwilson]

Upstream issue: https://gitlab.com/recursivenomad/ki-lime-pi-pico/-/issues/2