Update tools/tb-build-06-start-nightly-build after tor-browser-build#40829

In tor-browser-build#40829 (closed) we changed the name of browser installer/package artifacts, but tools/tb-build-06-start-nightly-build is still using the old names (when copying files for archiving).

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information