esr91 is missing "New identity" in hamburger menu

morganrequested to merge
morgan/tor-browser:40657 into tor-browser-91.2.0esr-11.0-1

Two fixups here, 1st fixes #40657 (closed) and 2nd hides the explicit 'new private browsing window' option when browser.privatebrowsing.autostart is enabled (eg when all windows are private browsing windows).

Edited by morgan

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