Fix typo in path for test_make_1d_quad_plots.py

[bryates]

The CI script test_make_1d_quad_plots.py has been failing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.52%. Comparing base (3ae0f05) to head (f6dd373).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #410      +/-   ##
==========================================
+ Coverage   27.17%   27.52%   +0.35%     
==========================================
  Files          28       28              
  Lines        4225     4225              
==========================================
+ Hits         1148     1163      +15     
+ Misses       3077     3062      -15     

Flag	Coverage Δ
unittests	27.52% <ø> (+0.35%)	⬆️

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[bryates]

@sscruz @Andrew42 did either of you have comments on this? It's just a small change to the CI.