added animations in exchange module

GMERemittance/Module/SendMoneyExchangeRate/User Interface/View/SendMoneyExchangeRateViewController.swift

@@ -225,6 +225,7 @@ class SendMoneyExchangeRateViewController: UIViewController {
     }
     
     private func configureViews() {
+        self.exchangeRateModel = nil
         self.exchangeRateLabel.isHidden = true
         self.exchangeRateLabel.alpha = 0
         self.transferFeeInfoLabel.isHidden = true