ensure dataframe doesn't scroll unless needed

[pngwn]

Description

There was some faulty logic when determining if a cell is on or off screen. Clicking a cell would sometimes scroll so that cell appeared at the bottom of the dataframe. This PR fixes it.

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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/c65ac3e1c1a7efb8856042f57b09eec04e88dcb7/gradio-3.43.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@c65ac3e1c1a7efb8856042f57b09eec04e88dcb7#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/dataframe	patch
gradio	patch

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With the following changelog entry.

ensure dataframe doesn't scroll unless needed

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[freddyaboulton]

Confirmed the fix locally thanks @pngwn !