wallet refactor: use CWalletTx member functions to determine tx state

src/wallet/interfaces.cpp

@@ -101,7 +101,7 @@ WalletTxStatus MakeWalletTxStatus(const CWallet& wallet, const CWalletTx& wtx)
     result.is_trusted = CachedTxIsTrusted(wallet, wtx);
     result.is_abandoned = wtx.isAbandoned();
     result.is_coinbase = wtx.IsCoinBase();
-    result.is_in_main_chain = wallet.IsTxInMainChain(wtx);
+    result.is_in_main_chain = wtx.isConfirmed();
     return result;
 }