core: hle: kernel: Disable dispatch count tracking on single core.

- This would have limited value, and would be a mess to handle properly.

src/core/cpu_manager.cpp

@@ -32,7 +32,7 @@ void CpuManager::Initialize() {
             core_data[core].host_thread = std::jthread(ThreadStart, std::ref(*this), core);
         }
     } else {
-        core_data[0].host_thread = std::jthread(ThreadStart, std::ref(*this), -1);
+        core_data[0].host_thread = std::jthread(ThreadStart, std::ref(*this), 0);
     }
 }