fix(parser): custom_template_dir not passed to data_model_type for OpenAPIScope.Parameters

[hambergerpls]

When generating OpenAPI Parameters model with custom_template_dir, it uses the default template rather than the customized one. It appears that custom_template_dir is not being passed when instantiating the class.

[codspeed-hq]

CodSpeed Performance Report

Merging #2166 will not alter performance

_{Comparing hambergerpls:main (bca53ea) with main (9969bf2)}

Summary

✅ 30 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9969bf2) to head (bca53ea).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2166   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           38        38           
  Lines         4276      4276           
  Branches       986       986           
=========================================
  Hits          4276      4276           

Flag	Coverage Δ
unittests	99.67% <ø> (ø)

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