FIX StatsCommand

[byvernault]

Fixes StatsCommand in Niftyseg interfaces.

Changes proposed in this pull request:

• typo error line 78, it was UnaryStats instead of StatsCommand.
• remove print statement in the StatsCommand.

Kind Regards,
Ben

[codecov-io]

Codecov Report

Merging #2106 into master will increase coverage by 23.6%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2106      +/-   ##
==========================================
+ Coverage   48.56%   72.17%   +23.6%     
==========================================
  Files         116     1144    +1028     
  Lines       23598    57604   +34006     
  Branches        0     8251    +8251     
==========================================
+ Hits        11461    41574   +30113     
- Misses      12137    14729    +2592     
- Partials        0     1301    +1301

Flag	Coverage Δ
#smoketests	72.17% <0%> (+23.6%)	⬆️
#unittests	69.79% <0%> (?)

Impacted Files	Coverage Δ
nipype/interfaces/niftyseg/stats.py	66.66% <0%> (ø)
nipype/interfaces/cmtk/parcellation.py	14.46% <0%> (ø)
...terfaces/freesurfer/tests/test_auto_Concatenate.py	85.71% <0%> (ø)
nipype/interfaces/tests/test_auto_SplitNifti.py	85.71% <0%> (ø)
nipype/utils/draw_gantt_chart.py	27.02% <0%> (ø)
...diffusion/tests/test_auto_gtractImageConformity.py	85.71% <0%> (ø)
...pe/interfaces/fsl/tests/test_auto_TractSkeleton.py	85.71% <0%> (ø)
nipype/interfaces/quickshear.py	100% <0%> (ø)
.../interfaces/fsl/tests/test_auto_PrepareFieldmap.py	85.71% <0%> (ø)
...ols/utilities/tests/test_auto_BRAINSEyeDetector.py	85.71% <0%> (ø)
... and 1084 more

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