Fix pixel shaders not loading (#9371)

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## Summary of the Pull Request
Fix for #9354

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## PR Checklist
* [x] Closes #9354
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] Tests added/passed
* [ ] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
* [ ] Schema updated.
* [x] I work here

(cherry picked from commit 5aaf5b4)

src/cascadia/TerminalApp/TerminalSettings.h

@@ -114,7 +114,7 @@ namespace winrt::TerminalApp::implementation
         GETSET_SETTING(TerminalApp::TerminalSettings, bool, SoftwareRendering, false);
         GETSET_SETTING(TerminalApp::TerminalSettings, bool, ForceVTInput, false);
 
-        GETSET_PROPERTY(hstring, PixelShaderPath);
+        GETSET_SETTING(TerminalApp::TerminalSettings, hstring, PixelShaderPath);
 
     private:
         std::optional<std::array<uint32_t, COLOR_TABLE_SIZE>> _ColorTable;