hotfix greater than/less than operations in pdb_manager

[a-r-j]

Reference Issues/PRs

What does this implement/fix? Explain your changes

Greater than / less than comparisons in oligomer selection in PDBManager are switched to greater than or less than.

What testing did you do to verify the changes in this PR?

Pull Request Checklist

• Added a note about the modification or contribution to the ./CHANGELOG.md file (if applicable)
• Added appropriate unit test functions in the ./graphein/tests/* directories (if applicable)
• Modify documentation in the corresponding Jupyter Notebook under ./notebooks/ (if applicable)
• Ran python -m py.test tests/ and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g., python -m py.test tests/protein/test_graphs.py)
• Checked for style issues by running black . and isort .

[codecov-commenter]

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Codecov Report

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

Project coverage is 45.23%. Comparing base (8123f42) to head (c780734).
Report is 184 commits behind head on master.

Files with missing lines	Patch %	Lines
graphein/ml/datasets/pdb_data.py	0.00%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
+ Coverage   40.27%   45.23%   +4.96%     
==========================================
  Files          48      113      +65     
  Lines        2811     8188    +5377     
==========================================
+ Hits         1132     3704    +2572     
- Misses       1679     4484    +2805     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud