refactor: Simplify feerate comparison statement

Author: yancyribbens

src/wallet/coinselection.cpp

@@ -93,7 +93,7 @@ std::optional<SelectionResult> SelectCoinsBnB(std::vector<OutputGroup>& utxo_poo
         bool backtrack = false;
         if (curr_value + curr_available_value < selection_target || // Cannot possibly reach target with the amount remaining in the curr_available_value.
             curr_value > selection_target + cost_of_change || // Selected value is out of range, go back and try other branch
-            (curr_waste > best_waste && (utxo_pool.at(0).fee - utxo_pool.at(0).long_term_fee) > 0)) { // Don't select things which we know will be more wasteful if the waste is increasing
+            (curr_waste > best_waste && (utxo_pool.at(0).fee > utxo_pool.at(0).long_term_fee))) { // Don't select things which we know will be more wasteful if the waste is increasing
             backtrack = true;
         } else if (curr_value >= selection_target) {       // Selected value is within range
             curr_waste += (curr_value - selection_target); // This is the excess value which is added to the waste for the below comparison