New Unsafe Browser tabs have the "Private Browsing" name and the Tor Browser icon

Regression with Tor Browser 9.0a7.

Might be because Torbutton, which is now integrated, in Tor Browser, forces private browsing mode even for the Unsafe Browser.

Feature Branch: bugfix/17142-unsafe-browser-tabs

Original created by @intrigeri on 17142 (Redmine)

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