TorSettings.defaultSettings() removed but still referenced by Moat.sys.mjs

It seems the defaultSettings() call was removed as part of a970113b, but the method is required for the Moat module in MoatRPC.#fixupSettings(). As a result the censorship-circumvention backend fails to apply the settings it applies and the user is unable to bootstrap.

This can be simulated by setting the torbrowser.debug.censorship_level number pref to 1.