[FIX]Add cropped files to dcm2niix output

[mauriliogenovese]

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fix for #3557

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 63.44%. Comparing base (685a1fb) to head (cf926c0).

Files	Patch %	Lines
nipype/interfaces/dcm2nii.py	83.33%	1 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3609   +/-   ##
=======================================
  Coverage   63.44%   63.44%           
=======================================
  Files         308      308           
  Lines       40888    40891    +3     
  Branches     5655     5657    +2     
=======================================
+ Hits        25942    25945    +3     
  Misses      13910    13910           
  Partials     1036     1036           

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