Fix velph-transport-plot

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 71.98%. Comparing base (3159f2e) to head (536b75a).
Report is 70 commits behind head on develop.

Files with missing lines	Patch %	Lines
...phelel/velph/cli/transport/plot/plot_selfenergy.py	0.00%	6 Missing ⚠️
.../phelel/velph/cli/transport/plot/plot_transport.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #57      +/-   ##
===========================================
- Coverage    73.21%   71.98%   -1.24%     
===========================================
  Files           77       81       +4     
  Lines         5500     5701     +201     
===========================================
+ Hits          4027     4104      +77     
- Misses        1473     1597     +124     

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