scanchain external mode data output default is incorrect

[mattvenn]

https://github.com/TinyTapeout/tinytapeout-02/blob/eabb16001a84007a71fd95a0e9def1a42030da64/verilog/rtl/user_defines.v#L88C66-L88C66

should be default output, not input.
This means that with no flash, clock, or caravel in reset, the pin will default to an input and the data from the end of the scanchain will be unavailable.

[mattvenn]

confirmed this result with RP2040 driving the chain. With no clock, caravel in reset (reset tied to 0v), there is no data on output of the chain (pin 30).
With clock enabled, same result.
With clock enabled and Caravel out of reset, external scan chain starts working.

[mattvenn]

Once gpio are setup, then caravel can be reset and clock stopped, and the external scan chain continues to work.