Open URL feature of KeepassX doesn't work anymore

In Tails 1.8.2, when clicking on “Open URL” in KeepassX, it used to open Tor Browser with the appropriate URL, in Tails 2.0 it doesn’t open Tor Browser.

Feature Branch: segfault:bugfix/11031-provide_gnome-open

Original created by @mercedes508 on 11031 (Redmine)

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