Edit delegation incorrect maximum value

[prcolaco]

When editing a delegation, the maximum amount available to delegate should be the amount already delegated plus the amount available for delegation at that moment. Currently it shows only the amount available, which can be less than the amount already delegated and makes it so that one cannot use the slider to change the values. But it accepts changing the values in the input boxes to higher than the maximum and even to broadcast the transaction, but then gets stuck at the spinner and no transaction is broadcasted...