Fix possible image drawing issues

[zhixuwei]

I have read the CLA Document and I sign the CLA

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improves image annotation logic in the plotting utility of YOLOv5.

📊 Key Changes

• Adjusted the loop in the plot_images function to iterate consistently over the entire batch size (bs).

🎯 Purpose & Impact

• Consistency in Annotations: Ensures that all images in the batch are consistently annotated, potentially increasing the reliability of visual output. 📷
• Improved Visualization: Enhances the clarity and accuracy of annotations in image mosaics, which is beneficial for users evaluating model predictions. 📈

[UltralyticsAssistant]

👋 Hello @zhixuwei, thank you for submitting an ultralytics/yolov5 🚀 PR! This is an automated response, and an Ultralytics engineer will assist you soon. In the meantime, to ensure a seamless integration of your work, please review the following checklist:

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[zhixuwei]

@glenn-jocher Simplify the loop conditions for this PR

[glenn-jocher]

@zhixuwei thank you, PR merged!