Fix classifier integration test

[HealthyPear]

Requirements

• Merge PR Improve debugging of integration testing #119
• Merge PR Bugfixes and improvements to protopipe-MODELS #122

Description

This PR fixes an error in the pipeline's testing workflow for which the testing function for the classifier(s) was actually using the energy regressor configuration file, thus not even using protons.

Caveat

Once this fix has been added the same integration test found an error in the execution of the script to build the models, so right now this PR cannot be merged until that error is fixed in a different PR (but it can be pre-reviewed).

[codecov]

Codecov Report

Merging #120 (ac3c4a4) into master (4c7a7fe) will increase coverage by 2.35%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #120      +/-   ##
==========================================
+ Coverage   47.61%   49.97%   +2.35%     
==========================================
  Files          22       22              
  Lines        1995     1995              
==========================================
+ Hits          950      997      +47     
+ Misses       1045      998      -47     

Impacted Files	Coverage Δ
protopipe/scripts/tests/test_pipeline.py	100.00% <100.00%> (ø)
protopipe/scripts/build_model.py	86.61% <0.00%> (+25.98%)	⬆️
protopipe/mva/train_model.py	88.23% <0.00%> (+27.45%)	⬆️

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