gui: Sort wallets in open wallet menu

src/qt/walletcontroller.h

@@ -8,7 +8,7 @@
 #include <qt/walletmodel.h>
 #include <sync.h>
 
-#include <list>
+#include <map>
 #include <memory>
 #include <vector>
 
@@ -41,7 +41,10 @@ public:
     ~WalletController();
 
     std::vector<WalletModel*> getWallets() const;
-    std::vector<std::string> getWalletsAvailableToOpen() const;
+
+    //! Returns all wallet names in the wallet dir mapped to whether the wallet
+    //! is loaded.
+    std::map<std::string, bool> listWalletDir() const;
 
     OpenWalletActivity* openWallet(const std::string& name, QWidget* parent = nullptr);
     void closeWallet(WalletModel* wallet_model, QWidget* parent = nullptr);