fix temperature

[Edoardo-Pedicillo]

This PR fixes #676, the issue was that the temperature was evaluated on the dataset with ground and excited points. What it should be done (not sure) is to consider the dataset containing only the ground state and evaluate the temperature with its predictions.

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.
• Compatibility with Qibo modules (Please edit this section if the current pull request is not compatible with the following branches).
  • Qibo: master
  • Qibolab: main
  • Qibolab_platforms_qrc: main

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5061441) 96.01% compared to head (01107ef) 95.97%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #697      +/-   ##
==========================================
- Coverage   96.01%   95.97%   -0.04%     
==========================================
  Files         106      106              
  Lines        7356     7359       +3     
==========================================
  Hits         7063     7063              
- Misses        293      296       +3     

Flag	Coverage Δ
unittests	95.97% <100.00%> (-0.04%)	⬇️

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

Files	Coverage Δ
...bocal/protocols/characterization/classification.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

[Jacfomg]

LGTM