BUG: Fixes nose cone bluffness issue #610

[Lucas-Prates]

Pull request type

Bug fix issue #610 .

• [x] Code changes (bugfix, features)

Checklist

• [x] Lint (black rocketpy/ tests/) has passed locally

Current behavior

The find_radius method inside the NoseCone class computes the square of its argument x. The lambda function, however, passes a list to it, causing a TypeError.

New behavior

Just pass the value instead of the list.

Breaking change

• [x] No

[Lucas-Prates]

As suggested by @Gui-FernandesBR, this might be a good indication to expand unit tests for aero_surface classes. This seems like an error that would have been caught by tests.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 73.56%. Comparing base (209434f) to head (836cde7). Report is 1 commits behind head on develop.

Files	Patch %	Lines
rocketpy/rocket/aero_surface.py	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #611 +/- ## =========================================== - Coverage 73.60% 73.56% -0.05% =========================================== Files 70 70 Lines 10310 10313 +3 =========================================== - Hits 7589 7587 -2 - Misses 2721 2726 +5 ```

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[Gui-FernandesBR]

As suggested by @Gui-FernandesBR, this might be a good indication to expand unit tests for aero_surface classes. This seems like an error that would have been caught by tests.

Don't worry, we can add more robust tests for aero_surfaces classes in the future. I think @lucasfourier should be aware of this.

Thank you for your fast solution, @Lucas-Prates !! Nice job, we are merging this one.