Fix icon/thumbnail spacing issue in Media Library after file upload

[Sukhendu2002]

This PR addresses a UI issue in the Media Library where icons or thumbnails of uploaded files appear to stick to the border of their containers after file upload.

How to Test:

1. Navigate to Media > Add New Media File in the WordPress admin dashboard.
2. Upload a file using the drag-and-drop area or the "Select Files" button.
3. Verify that the thumbnails/icons of the uploaded files no longer stick to the container's border and are appropriately spaced.

Trac ticket: https://core.trac.wordpress.org/ticket/62573

[github-actions]

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[github-actions]

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[audrasjb]

Looks good, thanks!

[audrasjb]

Committed in https://core.trac.wordpress.org/changeset/59550