staticiforme-prepare-cdn-dist-upload uses hardcoded torbrowser path for .htacess file generation

This script generates .htaccess file to redirect sha256sum.txt and sha256sum.incremental.txt to the sha256sum.unsigned-build.txt and sha256sums-unsigned-build.incrementals.txt. However the files are currently being written to the /srv/dist-master.torproject.org/htdocs/torbrowser/$tbb_version

Historically, we have always signed Mullvad Browser after Tor Browser (which has the same vesion) so during Mullvad Browser signing we would re-write the Tor Browser htaccess rules rather then generate them for Mullvad Browser.