Update sample configuration for classification

[scap3yvt]

Fixes #ISSUE_NUMBER

Proposed Changes

• the sample configuration for classification did not have the class_list, which is needed.

Checklist

• CONTRIBUTING guide has been followed.
• PR is based on the current GaNDLF master .
• Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change.
• Function/class source code documentation added/updated (ensure typing is used to provide type hints, including and not limited to using Optional if a variable has a pre-defined value).
• Code has been blacked for style consistency and linting.
• If applicable, version information has been updated in GANDLF/version.py.
• If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file.
• Usage documentation has been updated, if appropriate.
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation.
• If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3].

[github-actions]

MLCommons CLA bot All contributors have signed the MLCommons CLA ✍️ ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.60%. Comparing base (72bd1db) to head (376b8c2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #917      +/-   ##
==========================================
- Coverage   94.61%   94.60%   -0.02%     
==========================================
  Files         160      160              
  Lines        9470     9470              
==========================================
- Hits         8960     8959       -1     
- Misses        510      511       +1     

Flag	Coverage Δ
unittests	94.60% <ø> (-0.02%)	⬇️

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