Bug 40239: Don't download mar tools from old versions

boklmrequested to merge
boklm/tor-browser-build:bug_40239 into master

Before generating incremental mar files, we download mar files and mar-tools-linux64.zip from the previous version. However we use mar-tools from the new version and don't use the one from the old version, so there is no need to download it.

For #40239 (closed) and the next alpha.

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