workflows: remove invalid sync directory

[patrick-stephens]

Fixes #10085, checksum calculation is all assuming the /windows directory only. Instead we were overwriting the installers with the /windows/<version/ files which have a slightly different checksum.

Later staging-release-windows-checksums job needs them as well:

aws s3 sync "s3://${{ secrets.AWS_S3_BUCKET_RELEASE }}/windows" ./ --exclude "*" --include "*.sha256"

The change was introduced as part of #10040 to resolve failures seen with missing files in that checksum job. The files should not be missing though: staging build should create them and we should sync them here fine.

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