Settings: Add memory card directory option

src/duckstation-qt/memorycardsettingswidget.h

@@ -33,7 +33,11 @@ private:
   void createUi(SettingsDialog* dialog);
   void createPortSettingsUi(SettingsDialog* dialog, int index, PortSettingsUI* ui);
   void onBrowseMemoryCardPathClicked(int index);
+  void onResetMemoryCardPathClicked(int index);
   void onOpenMemCardsDirectoryClicked();
+  void onBrowseMemCardsDirectoryClicked();
+  void onResetMemCardsDirectoryClicked();
 
   std::array<PortSettingsUI, 2> m_port_ui = {};
+  QLineEdit* m_memory_card_directory = nullptr;
 };