change gsw calculation results to area in ha instead of percentage values

[codecov[bot]]

Codecov Report

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

Project coverage is 75.83%. Comparing base (c4d312c) to head (5609de3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #246 +/- ## ========================================== + Coverage 75.32% 75.83% +0.51% ========================================== Files 49 49 Lines 1844 1883 +39 ========================================== + Hits 1389 1428 +39 Misses 455 455 ```

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[goergen95]

Hi @karpfen, look good to me. Thanks! :+1: