add WithdrawAmount testTag

Author: piotr-iohk

app/src/main/java/to/bitkit/ui/screens/wallets/withdraw/WithdrawConfirmScreen.kt

@@ -47,7 +47,13 @@ fun WithdrawConfirmScreen(
             modifier = Modifier.padding(horizontal = 16.dp)
         ) {
             VerticalSpacer(16.dp)
-            BalanceHeaderView(sats = uiState.amount.toLong(), modifier = Modifier.fillMaxWidth())
+            BalanceHeaderView(
+                sats = uiState.amount.toLong(), 
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .testTag("WithdrawAmount"), 
+                testTag = "WithdrawAmount"
+            )
             VerticalSpacer(46.dp)
 
             BodyM(