Update npad.h

src/core/hle/service/hid/controllers/npad.h

@@ -119,6 +119,7 @@ public:
     void DisconnectNPad(u32 npad_id);
     LedPattern GetLedPattern(u32 npad_id);
     void SetVibrationEnabled(bool can_vibrate);
+    bool IsVibrationEnabled();
     void ClearAllConnectedControllers();
     void DisconnectAllConnectedControllers();
     void ConnectAllDisconnectedControllers();