Fix repeated architecture in distribute-latest-toolchain.sh

Co-authored-by: Yuta Saito <kateinoigakukun@gmail.com>

Author: MaxDesiatov

utils/webassembly/distribute-latest-toolchain.sh

@@ -120,6 +120,6 @@ release_id=$(create_release $toolchain_name $toolchain_name $head_sha)
 
 upload_tarball $release_id "$toolchain_name-ubuntu18.04-x86_64.tar.gz"
 upload_tarball $release_id "$toolchain_name-ubuntu20.04-x86_64.tar.gz"
-upload_tarball $release_id "$toolchain_name-macos-x86_64-x86_64.tar.gz"
+upload_tarball $release_id "$toolchain_name-macos-x86_64.tar.gz"
 
 popd