changing backend in ArtifactDetect

[djarecka]

not sure if this cause the #1965, but I believe that the backend should be set there anyway.

[satra]

restart circle. i think this looks reasonable.

[codecov-io]

Codecov Report

Merging #1969 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1969      +/-   ##
==========================================
- Coverage   72.63%   72.63%   -0.01%     
==========================================
  Files        1070     1070              
  Lines       54408    54410       +2     
  Branches     7858     7858              
==========================================
+ Hits        39519    39520       +1     
- Misses      13658    13659       +1     
  Partials     1231     1231

Flag	Coverage Δ
#smoketests	72.63% <100%> (-0.01%)	⬇️
#unittests	70.18% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
nipype/algorithms/rapidart.py	64.51% <100%> (+0.2%)	⬆️
nipype/interfaces/afni/base.py	59.79% <0%> (-1.04%)	⬇️

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