fix css syntax error

[pngwn]

Description

There was a CSS syntax error in the theme creation script, an extra curly brace was being added.

Fixes the failing storybook build.

Closes: #(issue)

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
🦄	Changes	detected!	Details

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Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/07068b4ef296e4036ba8f01b61db384d894a010c/gradio-5.1.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@07068b4ef296e4036ba8f01b61db384d894a010c#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/07068b4ef296e4036ba8f01b61db384d894a010c/gradio-client-1.6.0.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/07068b4ef296e4036ba8f01b61db384d894a010c/dist/lite.js""></script>

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
gradio	patch

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With the following changelog entry.

fix css syntax error

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[freddyaboulton]

hero 🔍

[aliabid94]

whoops I introduced that, thanks for the fix!