Replace s.consistency with sleep fn in scaffold

[pdaoust]

PR summary

This replaces the (now broken) await s.consistency() with a one-second sleep function in the scaffolded test script. Discovered when I was going through the blessing process for .52.

testing/benchmarking notes

( if any manual testing or benchmarking was/should be done, add notes and/or screenshots here )

followups

( any new tickets/concerns that were discovered or created during this work but aren't in scope for review here )

changelog

• [x] if this is a code change that effects some consumer (e.g. zome developers) of holochain core, then it has been added to our between-release changelog with the format

- summary of change [PR#1234](https://github.com/holochain/holochain-rust/pull/1234)

documentation

• [x] this code has been documented according to our docs checklist

[pdaoust]

Added quick note in the scaffold template to say that you'll probably need to adjust the timeout value.