Run nsga2 single-objective case on Windows

[ewu63]

Purpose

Based on the comments from @marcomangano in #351, I got rid of the platform check so that we are running the single-objective test on all platforms, and disabling the multi-objective test.

Expected time until merged

No rush.

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Merging #354 (9a98f96) into main (01dece2) will decrease coverage by 11.92%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #354       +/-   ##
===========================================
- Coverage   84.42%   72.51%   -11.92%     
===========================================
  Files          22       22               
  Lines        3307     3307               
===========================================
- Hits         2792     2398      -394     
- Misses        515      909      +394     

see 7 files with indirect coverage changes

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[marcomangano]

Great, thanks!