INU correction gone wrong

[oesteban]

fmriprep-1.5.1rc1 - ds005/sub-08

[oesteban]

ds051/sub-06

[oesteban]

Possibly duplicate of #127

[oesteban]

At least for the first case, the problem stems from a poor Atropos segmentation (ref. #109, as we will need to check Atropos' segmentation before forwarding it).

WM (necessary for the subsequent N4 step) is label 3 (the red spots):

[oesteban]

Because this one will rely on nipreps/niworkflows#506, I'm not marking this as a bugfix to the maintenance of old series.