Update parametric study file format for material_name

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.20%. Comparing base (44665b7) to head (aac45e8). Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...additive/core/parametric_study/parametric_study.py	92.30%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #494 +/- ## ========================================== - Coverage 97.22% 97.20% -0.03% ========================================== Files 34 34 Lines 3392 3397 +5 ========================================== + Hits 3298 3302 +4 - Misses 94 95 +1 ```

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