[send] Make send RPCs return fee reason

src/wallet/test/wallet_tests.cpp

@@ -524,8 +524,9 @@ public:
         int changePos = -1;
         bilingual_str error;
         CCoinControl dummy;
+        FeeCalculation fee_calc_out;
         {
-            BOOST_CHECK(wallet->CreateTransaction({recipient}, tx, fee, changePos, error, dummy));
+            BOOST_CHECK(wallet->CreateTransaction({recipient}, tx, fee, changePos, error, dummy, fee_calc_out));
         }
         wallet->CommitTransaction(tx, {}, {});
         CMutableTransaction blocktx;