gpui: Correct the image id in the example image_loading (#30990)

The image id "image-1" already exists so the id should be "image-4"

Release Notes:

- N/A
e9c9a8a269Michael Angerman committed on 5/20/2025, 7:36:41 AM· committed by GitHubparent315321b
1 file changedLine totals unavailable