Spike recording might be temporally reversed

When viewing these data through a headstage, the spikes look reversed in time:

https://github.com/open-ephys/ephys-test-board/blob/ac5d030bdda8c341b35de596793c35a0c1da531e/firmware/spikes.h#L9

<img width="1432" height="778" alt="Image" src="https://github.com/user-attachments/assets/a1da4924-98c1-42ec-ae33-fe62f6f7655c" />