Do not move downloaded zips

[glenn-jocher]

Prevent multiple downloads on HUB of same dataset

@kalenmike

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

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhancement to file download handling in the YOLOv5 codebase.

📊 Key Changes

• Simplified the logic for determining the destination filename when downloading a file.
• Modified the control flow to directly use the local file path if the file already exists in the current directory.

🎯 Purpose & Impact

• Reduction of redundancy: Prevents unnecessary renaming of files, resulting in cleaner, more efficient file handling.
• Improved code clarity: Makes it easier for developers to understand what happens during the file download process.
• Enhanced user experience: Users can expect more straightforward and reliable file downloads with fewer errors and better logging.