Make sure that `eink_abhängig_beschäftigt_y` is never negative.

[codecov[bot]]

Codecov Report

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

Project coverage is 89.49%. Comparing base (ca2f2ab) to head (31561e7).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #734 +/- ## ======================================= Coverage 89.49% 89.49% ======================================= Files 51 51 Lines 3627 3627 ======================================= Hits 3246 3246 Misses 381 381 ```

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