Use RAII version of folly::init

[assignUser]

Description

folly::init was deprecated recently and now throws a warning. In many places the use was corrected in #7700 but it caused issues with the fuzzer tests (see PR).

[majetideepak]

folly::Init{&argc, &argv, true}; is causing the Init object to be destroyed immediately and not at the end of main. That is why we are seeing issues with benchmark and fuzzer.
Looking at the RAII folly change here facebook/folly@7bf1486#diff-fe24748541a4b73975e31bb08821bb15c783ecdd74e2057d256c4cd1b893ba92
folly::init(&argc, &argv); is deprecated and the RAII version is folly::Init init(&argc, &argv);
The latter does call the RAII API.

[assignUser]

Ah so the problem was me, sorry xD I'll add a fix