taproot address null error fix

Author: julian-CStack

lib/wallets/crypto_currency/coins/bitcoin_frost.dart

@@ -255,6 +255,7 @@ class BitcoinFrost extends FrostCurrency {
       final clAddress = cl.Address.fromString(address, networkParams);
 
       return switch (clAddress) {
+        cl.P2TRAddress() => AddressType.p2tr,
         cl.P2PKHAddress() => AddressType.p2pkh,
         cl.P2WSHAddress() => AddressType.p2sh,
         cl.P2WPKHAddress() => AddressType.p2wpkh,

lib/wallets/crypto_currency/interfaces/electrumx_currency_interface.dart

@@ -18,6 +18,7 @@ mixin ElectrumXCurrencyInterface on Bip39HDCurrency {
         cl.P2PKHAddress() => AddressType.p2pkh,
         cl.P2WSHAddress() => AddressType.p2sh,
         cl.P2WPKHAddress() => AddressType.p2wpkh,
+        cl.P2TRAddress() => AddressType.p2tr,
         cl.MwebAddress() => AddressType.mweb,
         _ => null,
       };