SingleCore: Move Host Timing from a sepparate thread to main cpu thread.

src/core/core.cpp

@@ -158,6 +158,8 @@ struct System::Impl {
         kernel.SetMulticore(is_multicore);
         cpu_manager.SetMulticore(is_multicore);
         cpu_manager.SetAsyncGpu(is_async_gpu);
+        core_timing.SetMulticore(is_multicore);
+        cpu_manager.SetRenderWindow(emu_window);
 
         core_timing.Initialize([&system]() { system.RegisterHostThread(); });
         kernel.Initialize();