Fix incorrect netlify redirect test

[bluwy]

Changes

Fix incorrect assertion. Inside the try block, the assertion is intentionally failing to fail the test, however because it's still within the try block, the catch block will turn it back to passing, which is incorrect.

Testing

Ran the tests manually. Found this while working on withastro/astro#7889

Docs

n/a

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Latest commit: e18e16f

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[alexanderniebuhr]

lgtm