Fix bug

Author: fatemeh-i

wallet/wallet-app/src/main/kotlin/co/nilin/opex/wallet/app/service/DepositService.kt

@@ -347,7 +347,7 @@ class DepositService(
     ): PaymentDepositResponse {
 
         val currency = currencyService
-            .fetchCurrency(FetchCurrency(symbol = request.currency.name))
+            .fetchCurrency(FetchCurrency(symbol = request.currency))
             ?: throw OpexError.CurrencyNotFound.exception()
 
         val sourceOwner = walletOwnerManager