Hide Torbutton "Open Network Settings" menu entry when the Tor Launcher is not enabled

Using latest Iceweasel (24.7.0). Not sure if this is for Tails or for upstream, but nothing happens when clicking “Open Network Settings” in the Torbutton menu item.

Feature Branch: feature/9031-tor-browser-4.5

Related issues

Blocked by #9031 (closed)

Original created by @dct on 7647 (Redmine)

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