Wrong directory name in Tails Installer's tarball

tar tvf tails-installer_4.4.4+dfsg.orig.tar.gz outputs things like:

drwxrwxr-x root/root         0 2015-11-19 17:07 {tails-installer}-4.4.4/tests/

(note the curly braces).

Likely our release doc has some shell syntax mistake somewhere.

Original created by @intrigeri on 10691 (Redmine)

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