Remove workaround for showing the TBB's menu bar

We want to revert commit 63ed6bb if the TBB starts showing the menu bar by default again, which seems likely: https://lists.torproject.org/pipermail/tor-qa/2014-October/000478.html

Feature Branch: feature/8028-remove-unsafe-browser-test-menu-workaround

Original created by @anonym on 8028 (Redmine)

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