feat(wasm-utxo): mark BCH and BTG transaction support as complete

Updates the feature status in README to reflect that Bitcoin Cash and
Bitcoin Gold now have complete transaction support in the FixedScript wallet.

Issue: BTC-2656

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

packages/wasm-utxo/README.md

@@ -20,7 +20,7 @@ This project is under active development.
 | Descriptor Wallet: Address Support      | ✅ Complete | 🚫          | 🚫          | 🚫          | 🚫          | 🚫          | 🚫          |
 | Descriptor Wallet: Transaction Support  | ✅ Complete | 🚫          | 🚫          | 🚫          | 🚫          | 🚫          | 🚫          |
 | FixedScript Wallet: Address Generation  | ✅ Complete | ✅ Complete | ✅ Complete | ✅ Complete | ✅ Complete | ✅ Complete | ✅ Complete |
-| FixedScript Wallet: Transaction Support | ✅ Complete | ⏳ TODO     | ⏳ TODO     | ⏳ TODO     | ⏳ TODO     | ✅ Complete | ⏳ TODO     |
+| FixedScript Wallet: Transaction Support | ✅ Complete | ✅ Complete | ✅ Complete | ⏳ TODO     | ⏳ TODO     | ✅ Complete | ⏳ TODO     |
 
 ## Building