Fix #1689: Display the correct BAT value for one-time-tips

Also fixes the duplication of "USD" in the tips list

BraveRewardsUI/Settings/Tips/Details/TipsDetailViewController.swift

@@ -192,17 +192,19 @@ extension TipsDetailViewController: UITableViewDataSource, UITableViewDelegate {
       cell.siteImageView.image = UIImage(frameworkResourceNamed: "defaultFavicon")
       setFavicon(identifier: tip.id, pageURL: tip.url, faviconURL: tip.faviconUrl)
       cell.verifiedStatusImageView.isHidden = tip.status != .verified
+      let contribution = tip.weight
       switch tip.rewardsCategory {
       case .oneTimeTip:
         cell.typeNameLabel.text = Strings.OneTimeText + Date.stringFrom(reconcileStamp: tip.reconcileStamp)
+        cell.tokenView.batContainer.amountLabel.text = BATValue(probi: "\(contribution)")?.displayString
       case .recurringTip:
+        cell.tokenView.batContainer.amountLabel.text = BATValue(contribution).displayString
         cell.typeNameLabel.text = Strings.RecurringText
       default:
+        cell.tokenView.batContainer.amountLabel.text = ""
         cell.typeNameLabel.text = ""
       }
-      let contribution = tip.weight
-      cell.tokenView.batContainer.amountLabel.text = "\(contribution)"
-      cell.tokenView.usdContainer.amountLabel.text = state.ledger.dollarStringForBATAmount(contribution)
+      cell.tokenView.usdContainer.amountLabel.text = state.ledger.dollarStringForBATAmount(contribution, includeCurrencyCode: false)
       return cell
     }
   }