Fixed LE radius projection

[sseraj]

Purpose

The projection to the leading edge for the LE radius constraint currently projects points to the LE and TE even though only the LE point is used. @bernardopacini found that the TE projection can sometimes fail. Following @anilyil's suggestion, I changed the projection to only project to the LE.

Expected time until merged

1 week

Type of change

• [x] 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

The existing LE radius constraint tests pass.

Checklist

• [x] 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
• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9bbcdf0) 65.18% compared to head (4d577f5) 65.30%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #235 +/- ## ========================================== + Coverage 65.18% 65.30% +0.12% ========================================== Files 47 47 Lines 12123 12122 -1 ========================================== + Hits 7902 7916 +14 + Misses 4221 4206 -15 ```

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