FIX: update probtrackx2 outputs

[sitek]

updated PR from #2168

Changes proposed in this pull request

• added outputs['way_total'], a default output
• changed target file for omatrix1's outputs['network_matrix'] to matrix_seeds_to_all_targets, the correct probtrackx2 output file

[codecov-io]

Codecov Report

Merging #2169 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2169      +/-   ##
==========================================
- Coverage   72.25%   72.25%   -0.01%     
==========================================
  Files        1168     1168              
  Lines       58405    58406       +1     
  Branches     8400     8400              
==========================================
- Hits        42203    42201       -2     
- Misses      14868    14871       +3     
  Partials     1334     1334

Flag	Coverage Δ
#smoketests	72.25% <0%> (-0.01%)	⬇️
#unittests	69.91% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
nipype/interfaces/fsl/dti.py	76.22% <0%> (-0.15%)	⬇️
nipype/interfaces/base.py	83.3% <0%> (-0.19%)	⬇️

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