qt: Add message about not moving contents on dir change

src/yuzu/main.h

@@ -32,6 +32,11 @@ namespace Tegra {
 class DebugContext;
 }
 
+enum class EmulatedDirectoryTarget {
+    NAND,
+    SDMC,
+};
+
 class GMainWindow : public QMainWindow {
     Q_OBJECT
 
@@ -138,8 +143,7 @@ private slots:
     /// Called whenever a user selects the "File->Select Game List Root" menu item
     void OnMenuSelectGameListRoot();
     /// Called whenever a user select the "File->Select -- Directory" where -- is NAND or SD Card
-    /// (false for nand, true for sdmc)
-    void OnMenuSelectEmulatedDirectory(bool is_sdmc);
+    void OnMenuSelectEmulatedDirectory(EmulatedDirectoryTarget target);
     void OnMenuRecentFile();
     void OnConfigure();
     void OnAbout();