InputCommon: Fix deadlock in EmulatedController::UpdateReferences().

Source/Core/InputCommon/ControllerEmu/ControllerEmu.cpp

@@ -40,7 +40,7 @@ std::unique_lock<std::recursive_mutex> EmulatedController::GetStateLock()
 
 void EmulatedController::UpdateReferences(const ControllerInterface& devi)
 {
-  const auto lock = GetStateLock();
+  std::scoped_lock lk(s_get_state_mutex, devi.GetDevicesMutex());
 
   m_default_device_is_connected = devi.HasConnectedDevice(m_default_device);
 

Source/Core/InputCommon/ControllerInterface/CoreDevice.h

@@ -238,6 +238,8 @@ public:
                                           std::chrono::milliseconds confirmation_wait,
                                           std::chrono::milliseconds maximum_wait) const;
 
+  std::recursive_mutex& GetDevicesMutex() const { return m_devices_mutex; }
+
 protected:
   // Exclusively needed when reading/writing "m_devices"
   mutable std::recursive_mutex m_devices_mutex;