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

[via llvm-commits]

llvmbot wrote:

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Failed to cherry-pick: 73ce0aca72348a80dc2c2175516a0993ab8d6be3

https://github.com/llvm/llvm-project/actions/runs/16678563179

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

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