--single-cls segments fix

[glenn-jocher]

May resolve #10230

Signed-off-by: Glenn Jocher [email protected]

🛠️ PR Summary

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🌟 Summary

Improved data loader logic for single-class training in YOLOv5.

📊 Key Changes

• Removed redundant lines of code that unnecessarily modified segments during single-class training.

🎯 Purpose & Impact

• The simplification of the data loader will result in cleaner code and potentially fewer bugs.
• Users performing single-class training will benefit from this change, although the impact on training performance or results should be minimal.
• 🚀 This contributes to the overall maintainability and readability of the YOLOv5 codebase.