message: fix balance props for AddressSelect
diff: @@ -1763,7 +1763,7 @@ class Exchange extends PureComponent<ExchangeProps, ExchangeState> {
  label={<FormattedMessage id="Exchange_FromAddress" defaultMessage="From address" />}
  isDark={isDark}
  currency={haveCurrency}
  - balance={balances[sellCoin]}
  + balance={this.getBalance(sellCoin)}
  selectedType={haveType}
  role={AddressRole.Send}
  hasError={false}
  @@ -1796,7 +1796,7 @@ class Exchange extends PureComponent<ExchangeProps, ExchangeState> {
  isDark={isDark}
  role={AddressRole.Receive}
  currency={getCurrency}
  - balance={balances[buyCoin]}
  + balance={this.getBalance(buyCoin)}
  selectedType={getType}
  hasError={false}
  placeholder="To address"
  