qt: Add WalletFrame::currentWalletSet signal

The connection of the WalletFrame::currentWalletSet signal to
the BitcoinGUI::updateWalletStatus is a shorter and more descriptive way
to call both the setHDStatus and setEncryptionStatus member functions of
the BitcoinGUI class in comparison to using of the
WalletView::updateEncryptionStatus slot.

src/qt/bitcoingui.cpp

@@ -113,6 +113,7 @@ BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformSty
         connect(walletFrame, &WalletFrame::message, [this](const QString& title, const QString& message, unsigned int style) {
             this->message(title, message, style);
         });
+        connect(walletFrame, &WalletFrame::currentWalletSet, [this] { updateWalletStatus(); });
         setCentralWidget(walletFrame);
     } else
 #endif // ENABLE_WALLET

src/qt/walletframe.cpp

@@ -109,7 +109,8 @@ void WalletFrame::setCurrentWallet(WalletModel* wallet_model)
     walletView->updateGeometry();
 
     walletStack->setCurrentWidget(walletView);
-    walletView->updateEncryptionStatus();
+
+    Q_EMIT currentWalletSet();
 }
 
 void WalletFrame::removeWallet(WalletModel* wallet_model)

src/qt/walletframe.h

@@ -49,6 +49,7 @@ public:
 Q_SIGNALS:
     void createWalletButtonClicked();
     void message(const QString& title, const QString& message, unsigned int style);
+    void currentWalletSet();
 
 private:
     QStackedWidget *walletStack;