There was an security issue with TBB's native updater:
https://trac.torproject.org/projects/tor/ticket/13379
The Tor Project has fixed this in TBB version 4.5a3. (As per blog post.)
https://blog.torproject.org/blog/tor-browser-45a3-released
Forum discussion:
https://www.whonix.org/forum/index.php/topic,807.0.html
If 4.5a3 is the new stable at next Whonix release, then the patch mechanism to deactivate TBB's internal updater (function tb_run_function tb_patch_internal_updater_disable_maybe) should be deactivated.