fix: precondition error location to match other errors

[danielgtaylor]

This updates the error locations for precondition failed response errors to match the format used by Huma, where the request. portion is not explicit. This improved consistency within the project.

[codecov[bot]]

Codecov Report

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

Project coverage is 92.72%. Comparing base (bfa7e53) to head (ac9ece2).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #420 +/- ## ======================================= Coverage 92.72% 92.72% ======================================= Files 21 21 Lines 3546 3546 ======================================= Hits 3288 3288 Misses 220 220 Partials 38 38 ```

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