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As the comment in the removed code says, Tor Browser 7.5 does not ship
these files any more.

For reasons that still are elusive to me, the `7z u` this commit
replaces with `7z a` seems to be broken. I inserted `md5sum omni.ja`
before and after the `7z u` and it printed the same value, despite `7z
u` saying that that the expected files were changed and updated.

By updating the hack used to make Tor Browser consider uBlock Origin
to be a verified add-on.

Author: sajolida <sajolida@pimienta.org>
Date:   Thu Oct 19 09:39:04 2017 +0000

    Remove special treatment of banner on installation assistant (#14852)

    - Developers wondered several times whether this was on purpose or
      broken, so users probably wonder as well.
    - It make it hard to tweak the top section of our site, for example to
      include a donation banner.
    - It's broken on smaller screens and the text collapses with the logo.

I did not remove the corresponding line in the CSS - which I will delete anyway.
I'm applying this manually because cherry-picking and merging create too many conflicts.

Fix-committed: #15033

Fix-committed: #13403, #15024, #15064, #15197

At least with Tor Browser 7.5 without this pref set the default
becomes "tor-browser" (which presumably is the executable's directory,
i.e. /usr/local/lib/tor-browser) that we do not have permissions to
write to.

Will-fix: #15024

I will prepare Tails Installer 5.0.4 for Tails 3.5 in a few minutes,
so we don't need this overlay.

Refs: #14622

Merge remote-tracking branch 'origin/bugfix/14622-installer-check-space-before-deleting' into stable

Fix-committed: #14622

I need to use this step to check for other messages that don't start with "the
destination device". "^I am told that (.*)" would feel too broad given all steps
of our test suite share a single namespace, so I'm making this one as generic as
I can in the Tails Installer context.