Update Audio FFT example.
Update Audio FFT example.

* Note this works with the newer ulab that's not updated yet.

iabdalkader/openmv,iabdalkader/openmv,kwagyeman/openmv,openmv/openmv,iabdalkader/openmv,openmv/openmv,kwagyeman/openmv,iabdalkader/openmv,openmv/openmv,openmv/openmv,kwagyeman/openmv,kwagyeman/openmv