Fix backend tests on Windows

[abidlabs]

2 non-flaky tests were failing on Windows. Turns out one was a problem with the test, while the other was actually an issue in the code. Both should be fixed now.

[gradio-pr-bot]

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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/97cd3139fa22d3616e80eeda30fce68cfb74239d/gradio-4.9.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@97cd3139fa22d3616e80eeda30fce68cfb74239d#subdirectory=client/python"

[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 backend tests on Windows

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[freddyaboulton]

thanks @abidlabs !

[abidlabs]

Thanks @freddyaboulton