message: Exchange: change combinations again; fix 'Custom' option => button activation
diff: @@ -1248,15 +1248,15 @@ export default class Exchange extends Component {
  // temporarly disable some combinations (need test)
  const isErrorExternalDisabled =
  - (fromAddress && ![AddressType.Internal, AddressType.Custom].includes(fromAddress.type)) ||
  - (toAddress && ![AddressType.Internal, AddressType.Metamask].includes(toAddress.type))
  + (fromAddress && ![AddressType.Internal, AddressType.Metamask, AddressType.Custom].includes(fromAddress.type)) ||
  + (toAddress && ![AddressType.Internal, AddressType.Metamask, AddressType.Custom].includes(toAddress.type))
  const canStartSwap =
  !isErrorExternalDisabled &&
  !isNonOffers &&
  fromAddress &&
  - toAddress &&
  + toAddress && toAddress.value &&
  BigNumber(getAmount).isGreaterThan(0) &&
  !this.doesComissionPreventThisOrder() &&
  (BigNumber(haveAmount).isGreaterThan(balance) ||
  