Fix estimate fee

Sources/Stratis.Bitcoin.Features.Wallet/Controllers/DeStreamWalletController.cs

@@ -120,10 +120,10 @@ namespace Stratis.Bitcoin.Features.Wallet.Controllers
                         Amount = recipientModel.Amount
                     });
 
-                var context = new TransactionBuildContext(this._network)
+                var context = new DeStreamTransactionBuildContext(this._network)
                 {
                     AccountReference = new WalletAccountReference(request.WalletName, request.AccountName),
-                    FeeType = FeeParser.Parse(request.FeeType),
+                    FeeType = 0,
                     MinConfirmations = request.AllowUnconfirmed ? 0 : 1,
                     Recipients = recipients
                 };

Sources/Stratis.Bitcoin.Features.Wallet/WalletTransactionHandler.cs

@@ -235,8 +235,8 @@ namespace Stratis.Bitcoin.Features.Wallet
             this.AddRecipients(context);
             this.AddOpReturnOutput(context);
             this.AddCoins(context);
-            this.AddSecrets(context);
             this.FindChangeAddress(context);
+            this.AddSecrets(context);
             this.AddFee(context);
         }