chore(fortuna): make sync_point latch private

fortuna.h

@@ -26,7 +26,6 @@ public:
 	std::mutex print_mtx;
 	std::thread th_sfm;
 	std::thread th_urandom;
-	std::latch sync_point{1}; // wait for init before spawning the threads
 
 	Fortuna();
 	~Fortuna() noexcept;
@@ -114,6 +113,8 @@ public:
 	std::shared_ptr<accumulator::Accumulator> _p_accumulator{
 		std::make_shared<accumulator::Accumulator>()};
 
+	std::latch sync_point{1}; // wait for init before spawning the threads
+
 }; // class Fortuna
 
 } // namespace fortuna