Fix multinode demo, bank-hash is deprecated in ledger tool

[wen-coding]

ledger-tool has deprecated bank-hash in #1710, use the new command and parse the output.

[steviez]

Ugh dang it, thanks for catching this; I searched around a bit but must have missed this. I'm somewhat inclined to change the ledger-tool command to spit out only the hash so that we don't have to do any parsing here; thoughts ?

[wen-coding]

Ugh dang it, thanks for catching this; I searched around a bit but must have missed this. I'm somewhat inclined to change the ledger-tool command to spit out only the hash for the hash so that we don't have to do any parsing here; thoughts ?

That would be the best. I don't suppose many people need the "bank hash is:" part since they specifically asked for it.

[steviez]

Ugh dang it, thanks for catching this; I searched around a bit but must have missed this. I'm somewhat inclined to change the ledger-tool command to spit out only the hash for the hash so that we don't have to do any parsing here; thoughts ?

That would be the best. I don't suppose many people need the "bank hash is:" part since they specifically asked for it.

Sweet, I made #1745, which removes the extra text + updates the script. Will add you as a reviewer once CI completes