Bug 41165: Onion rewrite static pref causes a crash in debug builds

guest475646844requested to merge
guest475646844/tor-browser:41165_add-pref-into-func_tb-115.3.0esr-13.0-1 into tor-browser-115.3.0esr-13.0-1

This is a follow up MR to !765 (closed), please refer there for the context. Also please request review from @pierov, as in the original MR.

/cc @pierov

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