aux channel with muse2_bfn device

[danielemarinazzo]

ℹ Computer information

• Platform OS (e.g Windows, Mac, Linux etc): Windows
• Python Version: 3.7
• Brain Interface Used (e.g Muse, OpenBCI, Notion etc): Muse2

📝 Provide detailed reproduction steps (if any)

Read the data after running an experiment

✔️ Expected result

All channels including aux read

❌ Actual result

Aux channel not read

The problem is that here
https://github.com/NeuroTechX/eeg-notebooks/blob/ac1f5fb14d3c2baa8be0cc6ef0cfb87671060e95/eegnb/analysis/utils.py#L198
the aux channel index is coded for muse2, but not muse2_bfn.

Is it possible to fix this, or better use muse2 as input?

For the moment I just changed the directory name to muse2 instead of muse2_bfn.