Test in `metrics.chest_belt` fails, possibly due to deprecation

[smoia]

In metrics.chest_belt, there is a test failing, possibly due to deprecation:

phys2denoise/phys2denoise/tests/test_metrics_chest_belt.py

Line 27 in 709f3fd

@mark.xfail

@tsalo do you want to have a look?

Expected Behavior

Actual Behavior

Steps to Reproduce the Problem

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Specifications

- Python version: 
- phys2bids version:
- Platform:

Possible solution

[maestroque]

Should this be a failing test? In #54 it now passes