FIX: Use correct image for contour plotting

[effigies]

Should resolve various plotting issues.

[codecov-commenter]

Codecov Report

Patch coverage: 40.00% and project coverage change: -0.02 ⚠️

Comparison is base (647c895) 63.38% compared to head (8cae58c) 63.36%.

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Additional details and impacted files

@@               Coverage Diff               @@
##           maint/1.7.x     #785      +/-   ##
===============================================
- Coverage        63.38%   63.36%   -0.02%     
===============================================
  Files               49       49              
  Lines             5962     5965       +3     
  Branches          1170     1170              
===============================================
+ Hits              3779     3780       +1     
- Misses            2001     2003       +2     
  Partials           182      182              

Flag	Coverage Δ
reportlettests	∅ <ø> (∅)
unittests	50.62% <0.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
niworkflows/viz/utils.py	77.43% <40.00%> (-0.38%)	⬇️

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