Remove unused parameter

[martincostello]

• Remove unused parameter from change in fix schema for nullable enums #3377.
• Simplify duplicated condition.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.89%. Comparing base (557d074) to head (a0ca64b).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...Core.SwaggerGen/SchemaGenerator/SchemaGenerator.cs	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3395      +/-   ##
==========================================
+ Coverage   83.67%   84.89%   +1.22%     
==========================================
  Files          84       84              
  Lines        3290     3291       +1     
  Branches      578      579       +1     
==========================================
+ Hits         2753     2794      +41     
+ Misses        537      497      -40     

Flag	Coverage Δ
Linux	65.26% <83.33%> (-18.41%)	⬇️
Windows	65.26% <83.33%> (-18.41%)	⬇️
macOS	83.65% <83.33%> (-0.03%)	⬇️

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