Fix gallery thumbnail design regression

[hannahblair]

Description

Fixes a design regression in main (see here)

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Tests

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[gradio-pr-bot]

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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/e0dc4b49b801a4e5ea867efc08509c120e22e388/gradio-4.14.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@e0dc4b49b801a4e5ea867efc08509c120e22e388#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/gallery	minor
gradio	minor

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With the following changelog entry.

Fix gallery thumbnail design regression

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