remove unused node in FSL dmri workflow

[alexsavio]

No description provided.

[codecov-io]

Codecov Report

Merging #1847 into master will decrease coverage by -0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1847      +/-   ##
==========================================
- Coverage   73.09%   73.09%   -0.01%     
==========================================
  Files        1064     1064              
  Lines       53322    53321       -1     
==========================================
- Hits        38978    38977       -1     
  Misses      14344    14344

Flag	Coverage Δ
#unittests	73.09% <ø> (-0.01%)	❌

Impacted Files	Coverage Δ
nipype/workflows/dmri/fsl/utils.py	19.51% <ø> (-0.18%)	❌

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