add new coins to exchange (#499)

* add new coins

APE, AVAXC, BTT, BTTBSC, DOGE, FIRO, USDTTRC20, HBAR, SC, SOL, USDC, USDCSOL, ZEN, XVG

* remove UST icon

* remove xhv from excludeDepositCurrencies

* remove xhv from excludeReceiveCurrencies

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

@@ -69,6 +69,5 @@ class PickerItemWidget extends StatelessWidget {
         ),
       ),
     );
-    ;
   }
 }