labels.jpg names fix

[glenn-jocher]

Partially resolves #9360

Signed-off-by: Glenn Jocher glenn.jocher@ultralytics.com

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved label plotting function for better readability.

📊 Key Changes

• Altered the way class names are displayed in the label plotting function.
• Class names now derive from a dictionary's values rather than from an indexed list.

🎯 Purpose & Impact

• Enhanced Clarity: Users will experience clearer class name labels when visualizing data, especially when class names are stored in a dictionary structure.
• Greater Flexibility: This change supports different data structures for class names, allowing for more versatile use cases. 🔄