Change default shader style to plastic

[adamltyson]

Temporary fix for #327

We should make sure this change is communicated to users when the next release is made.

[codecov[bot]]

Codecov Report

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

Project coverage is 85.08%. Comparing base (42c3621) to head (68d5c43).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #350 +/- ## ========================================== - Coverage 86.47% 85.08% -1.40% ========================================== Files 27 27 Lines 1220 1220 ========================================== - Hits 1055 1038 -17 - Misses 165 182 +17 ```

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