Fix unit tests for DDI and TwoSides

[benedekrozemberczki]

Summary

Incorrect shapes

• [X] Code passes all tests
• [X] Unit tests provided for these changes
• [X] Documentation and docstrings added for these changes

Changes

• Shapes corrected

[codecov-commenter]

Codecov Report

Merging #51 (c358754) into main (b2e7532) will decrease coverage by 0.22%. The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   98.68%   98.45%   -0.23%     
==========================================
  Files          27       27              
  Lines         682      712      +30     
==========================================
+ Hits          673      701      +28     
- Misses          9       11       +2     

Impacted Files	Coverage Δ
chemicalx/data/datasetloader.py	94.73% <71.42%> (-3.31%)	:arrow_down:
chemicalx/data/__init__.py	100.00% <100.00%> (ø)
tests/unit/test_dataset.py	100.00% <100.00%> (ø)

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