ControllerInterface: Make UpdateInput / UpdateOutput return void

The return values here have never been checked, so it doesn't make sense
to return a value to begin with.

Source/Core/InputCommon/ControllerInterface/DInput/DInputJoystick.h

@@ -52,7 +52,7 @@ private:
 	};
 
 public:
-	bool UpdateInput();
+	void UpdateInput() override;
 
 	Joystick(const LPDIRECTINPUTDEVICE8 device, const unsigned int index);
 	~Joystick();