Update progress.sh

[anacrolix]

Misc tweaks from banging my head while getting a node running locally.

[Chomtana]

So, this is mostly about syntax simplification, removing deprecated OP Goerli Testnet and typo fix right?

progress.sh main problem would be it can't work with snap sync

[anacrolix]

Yeah I had issues running it due to cast missing, added set -e to catch that and discovered that the expr math caused it to fail if I had progressed no blocks. So I kept poking it until it ended up in the current state.

But also I didn't know that about the snap sync thing, that explains why I was getting no progress.

It's a pretty minor thing to change but it's more robust and useful than it was and saves someone else tripping on everything I did and ending up at the same place.