rpc: Remove invalid explanation from wallet fee message

src/wallet/rpcwallet.cpp

@@ -362,7 +362,7 @@ static void SendMoney(const CTxDestination &address, CAmount nValue, bool fSubtr
     vecSend.push_back(recipient);
     if (!pwalletMain->CreateTransaction(vecSend, wtxNew, reservekey, nFeeRequired, nChangePosRet, strError)) {
         if (!fSubtractFeeFromAmount && nValue + nFeeRequired > pwalletMain->GetBalance())
-            strError = strprintf("Error: This transaction requires a transaction fee of at least %s because of its amount, complexity, or use of recently received funds!", FormatMoney(nFeeRequired));
+            strError = strprintf("Error: This transaction requires a transaction fee of at least %s", FormatMoney(nFeeRequired));
         throw JSONRPCError(RPC_WALLET_ERROR, strError);
     }
     if (!pwalletMain->CommitTransaction(wtxNew, reservekey, g_connman.get()))