Fix OBJ unlit color space

[Meakk]

Describe your changes

Fixed issue reported here: https://discord.com/channels/1046005690809978911/1503472626625019904

Issue ticket number and link if any

Checklist for finalizing the PR

• I have performed a self-review of my code
• I have added tests for new features and bugfixes
• I have added documentation for new features
• If it is a modifying the libf3d API, I have updated bindings
• If it is a modifying the .github/workflows/versions.json, I have updated docker_timestamp

AI Disclosure

• I did not use AI to generate any of the content of that pull request
• I used AI to generate code in that pull request, if yes please disclose which part of the code was generated and with which model.
• ...

Continuous integration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.20%. Comparing base (0272116) to head (3e66228).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3147   +/-   ##
=======================================
  Coverage   97.19%   97.20%           
=======================================
  Files         211      211           
  Lines       17134    17188   +54     
=======================================
+ Hits        16654    16708   +54     
  Misses        480      480           

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