FIX: Address some reliability issues of the functional masking workflow

[oesteban]

Replaces: #707.
Addresses: nipreps/fmriprep#2731.

[mgxd]

@oesteban we disabled the masks/ regression test (see #671) - perhaps it would be good to re-add and see if this improvement addresses the intermittent issues we were experiencing

[mgxd]

Something went wrong with the merge..

[oesteban]

:S

[oesteban]

Ha! Yes, I think that makes sense.

[effigies]

@oesteban I pushed the pre-rebase version (97be9e5) from #707 to https://github.com/nipreps/niworkflows/compare/restore-707 if you just want to use that.

[oesteban]

Okay, the merge doesn't seem great :(

[codecov-commenter]

Codecov Report

Merging #711 (97be9e5) into master (e1f4267) will increase coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head 97be9e5 differs from pull request most recent head 0509a28. Consider uploading reports for the commit 0509a28 to get more accurate results

@@           Coverage Diff           @@
##           master     #711   +/-   ##
=======================================
  Coverage   49.18%   49.19%           
=======================================
  Files          49       49           
  Lines        5866     5865    -1     
  Branches      837      837           
=======================================
  Hits         2885     2885           
+ Misses       2872     2871    -1     
  Partials      109      109           

Flag	Coverage Δ
reportlettests	∅ <ø> (∅)
unittests	49.19% <0.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
niworkflows/func/util.py	18.18% <0.00%> (+0.20%)	⬆️

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