Fix Qt wallet model ownership calls

src/qt/triangles.cpp

@@ -229,7 +229,7 @@ int main(int argc, char *argv[])
                 // calling Shutdown().
 
                 ClientModel clientModel(&optionsModel);
-                WalletModel walletModel(pwalletMain, &optionsModel);
+                WalletModel walletModel(pwalletMain.get(), &optionsModel);
 
                 window.setClientModel(&clientModel);
                 window.setWalletModel(&walletModel);

src/qt/trianglesgui.cpp

@@ -656,7 +656,7 @@ void TrianglesGUI::ensureMessageModel()
     if(messageModel || !walletModel)
         return;
 
-    setMessageModel(new MessageModel(pwalletMain, walletModel, this));
+    setMessageModel(new MessageModel(pwalletMain.get(), walletModel, this));
 }
 
 void TrianglesGUI::ensureSendCoinsPage()