Fix issue where styling changes were overridden when value was updated simultaneously

[abidlabs]

Closes: #10572

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
	Storybook	ready!	Storybook preview
🦄	Changes	detecting...

---

Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/31f17f607d3f4233166a180f25949c8ef28d6092/gradio-5.16.1-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@31f17f607d3f4233166a180f25949c8ef28d6092#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/31f17f607d3f4233166a180f25949c8ef28d6092/gradio-client-1.12.0.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/31f17f607d3f4233166a180f25949c8ef28d6092/dist/lite.js""></script>

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/dataframe	patch
gradio	patch

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

With the following changelog entry.

Looking into df styling issue

Maintainers or the PR author can modify the PR title to modify this entry.

Something isn't right?

• Maintainers can change the version label to modify the version bump.
• If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can update the changelog file directly.

[abidlabs]

The problem was that previously Table.svelte was emitting changes upwards but with an empty metadata key, which was overriding the styling. Now we only look at the headers and data that are passed upwards