Fix remaining compilation errors

- Remove duplicate walletProvider declaration in banking screen
- All compilation errors should now be resolved for Linux build

Author: ColinRitman

lib/screens/banking/banking_screen.dart

@@ -60,7 +60,6 @@ class _BankingScreenState extends State<BankingScreen>
       final walletProvider = Provider.of<WalletProvider>(context, listen: false);
 
       // Get the actual private key from the wallet provider
-      final walletProvider = Provider.of<WalletProvider>(context, listen: false);
       final wallet = walletProvider.wallet;
 
       if (wallet == null) {