Remove default value in for Type in ErrorModel

[hiddenmarten]

Hi,

I'm not sure if this "fix" is really necessary, but I faced an issue using huma with openapigenerator.

The thing is about:blank is not suitable for the most of uri validators (in my case one included in R client), so my solution was to remove it from the result openapi spec, probably it would be helpful to remove or update it here.

Thanks for your project, it's great!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.69%. Comparing base (2a548cc) to head (d3d61af).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #952   +/-   ##
=======================================
  Coverage   92.69%   92.69%           
=======================================
  Files          23       23           
  Lines        4571     4571           
=======================================
  Hits         4237     4237           
  Misses        275      275           
  Partials       59       59           

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