pre-populate tx hash field when closing dispenser

[jdogresorg]

It seems that updating the "Close Dispenser" form to allow the user to specify the tx hash (to allow closing from origin address) broke this functionality.... previously the tx hash was written to a hidden form field... and it seems that now that there is a field for tx hash, the tx hash which SHOULD auto-populate the field is not functioning... I'll create a github issue about this and get it fixed on Tuesday 🙂