fix: useless assertion in TestFeatures/response-image

[alexandear]

The PR fixes the assertion for TestFeatures/response-image.

assert.NotEmpty(t, "binary", api.OpenAPI().Paths["/response-image"].Get.Responses["200"].Content["image/png"]) checks that "binary" is not empty, which is useless.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.77%. Comparing base (e73d655) to head (44155a7).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #677   +/-   ##
=======================================
  Coverage   92.77%   92.77%           
=======================================
  Files          22       22           
  Lines        4915     4915           
=======================================
  Hits         4560     4560           
  Misses        308      308           
  Partials       47       47           

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[danielgtaylor]

Thanks!