wallet: Determine IsFromMe by checking for TXOs of inputs

Instead of checking whether the total amount of inputs known by the
wallet is greater than 0, we should be checking for whether the input is
known by the wallet. This enables us to determine whether a transaction
spends an of output with an amount of 0, which is necessary for marking
0-value dust outputs as spent.

src/wallet/wallet.cpp

@@ -1634,7 +1634,11 @@ bool CWallet::IsMine(const COutPoint& outpoint) const
 
 bool CWallet::IsFromMe(const CTransaction& tx) const
 {
-    return (GetDebit(tx) > 0);
+    LOCK(cs_wallet);
+    for (const CTxIn& txin : tx.vin) {
+        if (GetTXO(txin.prevout)) return true;
+    }
+    return false;
 }
 
 CAmount CWallet::GetDebit(const CTransaction& tx) const