[lld] [Test] Adjust quoting in archive-thin.test for spaces in paths (PR #151707)

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bd1976bris wrote:

@tru the backport request for this failed. See my comment https://github.com/llvm/llvm-project/pull/151674#pullrequestreview-3079635393 on https://github.com/llvm/llvm-project/pull/151674

https://github.com/llvm/llvm-project/pull/151707