Device handle should not be a random id, instead it's the current npad id

Found during hardware testing

src/core/hle/service/nfp/nfp.cpp

@@ -317,7 +317,7 @@ private:
     }
 
     bool has_attached_handle{};
-    const u64 device_handle{Common::MakeMagic('Y', 'U', 'Z', 'U')};
+    const u64 device_handle{0}; // Npad device 1
     const u32 npad_id{0};       // Player 1 controller
     State state{State::NonInitialized};
     DeviceState device_state{DeviceState::Initialized};