message: show 0 fee when sending to a username
diff: @@ -325,7 +325,7 @@ export const SendBitcoinScreen: React.FC = observer(({ route }) => {
  const feeTextFormatted = textCurrencyFormatting(fee ?? 0, price, store.prefCurrency)
  - const feeText = fee === null ?
  + const feeText = fee === null && !usernameExists ?
  "" :
  fee > 0 && !!amount ?
  `${feeTextFormatted}, ${translate("common.Total")}: ${textCurrencyFormatting(fee + amount, price, store.prefCurrency)}`:
  