[Bug][Wallet] Fix CWallet::GetMinimumFee improperly set to feePerKb

nFeeNeeded is an absolute value (feePerKb * txKb).
Github-Pull: #1575
Rebased-From: 08092dd

src/wallet/wallet.cpp

@@ -2800,9 +2800,6 @@ CAmount CWallet::GetMinimumFee(unsigned int nTxBytes, unsigned int nConfirmTarge
 {
     // payTxFee is user-set "I want to pay this much"
     CAmount nFeeNeeded = payTxFee.GetFee(nTxBytes);
-    // user selected total at least (default=true)
-    if (fPayAtLeastCustomFee && nFeeNeeded > 0 && nFeeNeeded < payTxFee.GetFeePerK())
-        nFeeNeeded = payTxFee.GetFeePerK();
     // User didn't set: use -txconfirmtarget to estimate...
     if (nFeeNeeded == 0)
         nFeeNeeded = pool.estimateFee(nConfirmTarget).GetFee(nTxBytes);