Make CCheckQueue destructor stop worker threads

src/bench/checkqueue.cpp

@@ -61,7 +61,6 @@ static void CCheckQueueSpeedPrevectorJob(benchmark::Bench& bench)
         // it is done explicitly here for clarity
         control.Wait();
     });
-    queue.StopWorkerThreads();
     ECC_Stop();
 }
 BENCHMARK(CCheckQueueSpeedPrevectorJob, benchmark::PriorityLevel::HIGH);