Fix plot_wing.py to work for matplotlib v3.8+

[shamsheersc19]

Purpose

Fix plot_wing.py to work for matplotlib v3.8+. The dist attribute for 3-D plots has been deprecated in recent matplotlib versions. See related Issue #423

Also made the 3-D view behavior consistent in plot_wingbox.py (the 3-D view should not reset if the iteration is changed).

Expected time until merged

1 day Code review should only take a few minutes.

Type of change

Bugfix (non-breaking change which fixes an issue)

Testing

Ran the run_CRM.py and run_aerostruct_uCRM_multipoint.py examples, and also confirmed that the views don't reset it the iteration is changed. Tested with matplotlib versions:

• 3.6.0
• 3.7.0
• 3.8.0
• 3.8.3

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
• [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:

Project coverage is 93.95%. Comparing base (a8a272a) to head (1803ed0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #425 +/- ## ======================================= Coverage 93.95% 93.95% ======================================= Files 104 104 Lines 6470 6470 ======================================= Hits 6079 6079 Misses 391 391 ```

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