FIX: Typo in private method name

[effigies]

#1966 bug.

Sorry.

[effigies]

Testing locally. Will post when I'm sure this fixes the problem.

[effigies]

Fixes the issue. ReconAll runs fine with and without existing expert options.

[codecov-io]

Codecov Report

Merging #1978 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1978   +/-   ##
======================================
  Coverage    72.6%   72.6%           
======================================
  Files        1070    1070           
  Lines       54456   54456           
  Branches     7868    7868           
======================================
  Hits        39537   39537           
  Misses      13686   13686           
  Partials     1233    1233

Flag	Coverage Δ
#smoketests	72.6% <ø> (ø)	⬆️
#unittests	70.15% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
nipype/interfaces/freesurfer/preprocess.py	65.28% <ø> (ø)	⬆️

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