How do I add a third SPIButton mode?

[dracc]

I'm currently trying to set up an RP2040 Zero as an SPI button bridge.
The default communication dialect for the RP2040 differs from both the PISOSR and TrustMaster modes.
Thus I tried adding a third definition into the SPI_BtnMode enum and the speed_names vector.
It seems to work fine once I set it in the OpenFFBoard Configurator but it resets to the TM mode if I unplug/replug it.
Starting OpenFFBoard Configurator, opening the SPI Buttons dialog (which defaults correctly to the mode I've set) and pressing "Apply" fixes it, until the next unplug/replug.

What am I missing here?

[dracc]

Turns out the SPI_Buttons constructor sets up with the values stored in flash, and then re-inits SPI with a few hardcoded values which overwrote what I'm trying to set in setConfig(). I've updated my PR (#163) to fix this.