BUG: Sideslip Angle and Damping Coefficient Calculation

[MateusStano]

Pull request type

• [x] Code changes (bugfix, features)

Checklist

• [x] Lint (black rocketpy/ tests/) has passed locally
• [x] All tests (pytest tests -m slow --runslow) have passed locally
• [x] CHANGELOG.md has been updated (if relevant)

Description

Fixed the calculation of the angle of sideslip to be in accordance with the documentation.

Fixed the sign of the damping coefficient in the LinearGenericSurface

[codecov[bot]]

Codecov Report

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

Project coverage is 76.08%. Comparing base (a6a0f74) to head (1574aea). Report is 18 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #729 +/- ## =========================================== + Coverage 75.95% 76.08% +0.12% =========================================== Files 99 95 -4 Lines 11237 10997 -240 =========================================== - Hits 8535 8367 -168 + Misses 2702 2630 -72 ```

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