MappingButton: grab and release mouse and keyboard instead of calling parent SetBlockInputs

Source/Core/DolphinQt2/Config/Mapping/MappingWindow.h

@@ -53,7 +53,6 @@ public:
   const ciface::Core::DeviceQualifier& GetDeviceQualifier() const;
   std::shared_ptr<ciface::Core::Device> GetDevice() const;
 
-  void SetBlockInputs(const bool block);
   ControllerEmu::EmulatedController* GetController() const;
 signals:
   void Update();
@@ -80,8 +79,6 @@ private:
   void OnProfileChanged(int index);
   void OnDeviceChanged(int index);
 
-  bool event(QEvent* event) override;
-
   ControllerEmu::EmulatedController* m_controller = nullptr;
 
   // Main
@@ -114,7 +111,6 @@ private:
   Type m_mapping_type;
   const int m_port;
   bool m_is_complex;
-  bool m_block = false;
   InputConfig* m_config;
   ciface::Core::DeviceQualifier m_devq;
 };