fix #1950 dcm2niix output files extension format

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[codecov-io]

Codecov Report

Merging #1951 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #1951      +/-   ##
=========================================
- Coverage    72.5%   72.5%   -0.01%     
=========================================
  Files        1063    1063              
  Lines       54204   54206       +2     
  Branches     7823    7824       +1     
=========================================
  Hits        39302   39302              
- Misses      13681   13683       +2     
  Partials     1221    1221

Flag	Coverage Δ
#smoketests	72.5% <0%> (-0.01%)	⬇️
#unittests	70.05% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
nipype/interfaces/dcm2nii.py	43.06% <0%> (-0.42%)	⬇️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4132376...f730115. Read the comment docs.

[codecov-io]

Codecov Report

Merging #1951 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #1951      +/-   ##
=========================================
- Coverage    72.5%   72.5%   -0.01%     
=========================================
  Files        1063    1063              
  Lines       54204   54206       +2     
  Branches     7823    7824       +1     
=========================================
  Hits        39302   39302              
- Misses      13681   13683       +2     
  Partials     1221    1221

Flag	Coverage Δ
#smoketests	72.5% <0%> (-0.01%)	⬇️
#unittests	70.05% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
nipype/interfaces/dcm2nii.py	43.06% <0%> (-0.42%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4132376...f730115. Read the comment docs.