get-win32-tarballs: Fix incorrect parenthesization
Previously the download fallback wasn't parenthesized correctly, resulting in the mirror being consulted regardless of whether the downloads.haskell.org download succeeded.
Fixes #18821 (closed).
Previously the download fallback wasn't parenthesized correctly, resulting in the mirror being consulted regardless of whether the downloads.haskell.org download succeeded.
Fixes #18821 (closed).