Fix FTP support

Originally created by Tails on #6096 (Redmine)

In Tails 0.12.1, I manage to connect to a FTP server on the Internet (such as ftp.de.debian.org) neither with iceweasel nor with GNOME "Connect to server" feature.

At least the latter works properly to connect to a FTP server on the LAN by IP.

See bug 3290 on Tor Project’s Trac.

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