Fix message text overflow onto copy button in gr.Chatbot

[hannahblair]

Description

This PR increases the message padding before copy button, preventing the text from overflowing onto the new copy button.

Content boundary before 🐛

and after 💅

Closes: #5196

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/6aa8e913fb81bb43c9e9a08a0a1d6a8f868b70f4/gradio-3.40.1-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@6aa8e913fb81bb43c9e9a08a0a1d6a8f868b70f4#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/chatbot	patch
gradio	patch

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Fix message text overflow onto copy button in gr.Chatbot

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[abidlabs]

nice @hannahblair! lgtm