Fix (Cart): Use dynamic type for display

[mamhoff]

Summary

Without this fix, all adjustments, even if they are promotion adjustments, are displayed as "Tax".

Checklist

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[codecov[bot]]

Codecov Report

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

Project coverage is 95.98%. Comparing base (6e2f055) to head (33d46c7).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #365 +/- ## ========================================== - Coverage 95.99% 95.98% -0.02% ========================================== Files 207 207 Lines 4874 4861 -13 ========================================== - Hits 4679 4666 -13 Misses 195 195 ```

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