Merge #17939: gui: Remove warning "unused variable 'wallet_model'"

c279a81 gui: Remove warning "unused variable 'wallet_model'" (João Barbosa)

Pull request description:

  This was part of the abandoned #15150.

ACKs for top commit:
  theStack:
    utACK bitcoin/bitcoin@c279a81
  fanquake:
    ACK c279a81 - tested wallet loading/unloading in the qt rpc console.

Tree-SHA512: 8fbd55c7e213599c7be843b52e960a16cf965b3e01489f426ac3ed9d579d78bb4b2ac230bcccd8abe0397a8b1166ee10e0d685738441a77a5dcb5135c15790fa

Author: fanquake

src/qt/rpcconsole.cpp

@@ -905,12 +905,8 @@ void RPCConsole::on_lineEdit_returnPressed()
 
         cmdBeforeBrowsing = QString();
 
-        WalletModel* wallet_model{nullptr};
 #ifdef ENABLE_WALLET
-        const int wallet_index = ui->WalletSelector->currentIndex();
-        if (wallet_index > 0) {
-            wallet_model = ui->WalletSelector->itemData(wallet_index).value<WalletModel*>();
-        }
+        WalletModel* wallet_model = ui->WalletSelector->currentData().value<WalletModel*>();
 
         if (m_last_wallet_model != wallet_model) {
             if (wallet_model) {