Tor Browser cannot load libmozsandbox.so

#15704 (closed) is back in 4.0~beta2:

tor-browser.desktop[6057]: ERROR: ld.so: object 'libmozsandbox.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.

I don’t know what’s the impact but it does not sound too good.

Feature Branch: feature/16356-tor-browser-9.0+force-all-tests, torbrowser-launcher:feature/16356-tor-browser-9.0+force-all-tests

Original created by @intrigeri on 17018 (Redmine)

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