CAKE-341 | fixed scrollbar for currency_picker.dart; applied receive currency list to exchange_template_page.dart

lib/src/screens/exchange/exchange_template_page.dart

@@ -176,7 +176,7 @@ class ExchangeTemplatePage extends BasePage {
                             initialIsAddressEditable:
                             exchangeViewModel.isReceiveAddressEnabled,
                             isAmountEstimated: true,
-                            currencies: CryptoCurrency.all,
+                            currencies: exchangeViewModel.receiveCurrencies,
                             onCurrencySelected: (currency) =>
                                 exchangeViewModel.changeReceiveCurrency(
                                     currency: currency),

lib/src/screens/exchange/widgets/currency_picker.dart

@@ -45,6 +45,7 @@ class CurrencyPickerState extends State<CurrencyPicker> {
     color: Palette.darkBlueCraiola,
   );
   final int crossAxisCount = 3;
+  final int maxNumberItemsInAlert = 12;
   final int itemsCount;
   final double backgroundHeight = 280;
   final double thumbHeight = 72;
@@ -148,6 +149,7 @@ class CurrencyPickerState extends State<CurrencyPicker> {
                                         );
                                       })
                               ),
+                              if (itemsCount > maxNumberItemsInAlert)
                               CakeScrollbar(
                                   backgroundHeight: backgroundHeight,
                                   thumbHeight: thumbHeight,