No Torbutton icon since the migration to FF31

Originally created by @intrigeri on #7985 (Redmine)

In a build from commit 4ba31985f (that includes some nightly build of the FF31-based TBB) I see no Torbutton icon. Looking at Torbutton’s changelog in Git, it seems that we need a snapshot of Torbutton 1.7 to get this back.

Parent Task: #7238 (closed)

Edited May 15, 2020 by intrigeri

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