feebumper: discard change outputs below discard rate

Author: instagibbs

src/wallet/feebumper.cpp

@@ -194,7 +194,7 @@ Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoin
 
     // If the output would become dust, discard it (converting the dust to fee)
     poutput->nValue -= nDelta;
-    if (poutput->nValue <= GetDustThreshold(*poutput, ::dustRelayFee)) {
+    if (poutput->nValue <= GetDustThreshold(*poutput, GetDiscardRate(::feeEstimator))) {
         LogPrint(BCLog::RPC, "Bumping fee and discarding dust output\n");
         new_fee += poutput->nValue;
         mtx.vout.erase(mtx.vout.begin() + nOutput);