No Torbutton icon since the migration to FF31

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)

Original created by @intrigeri on 7985 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information