Quick start tutorial - genesis config file naming fix

[ILoomans]

setup fix

Description

This is a simple fix for the Quick Start tutorial found here.

Without this fix, the user will experience this error:

  github.com/ethereum-optimism/optimism/op-program/host/config
  ./bin/op-program configs check-custom-chains
  t=2025-10-12T21:01:07+0100 lvl=crit msg="Application failed" err="invalid config file name: 16584-genesis.json, Make sure that the only files in the custom config directory are placeholder.json, depsets.json, <chain-id>-genesis-l2.json or <chain-id>-rollup.json"
  make[2]: *** [check-custom-chains] Error 1
  make[1]: *** [reproducible-prestate] Error 2
  make: *** [setup] Error 2

This is because the ./op-program configs check-custom-chains expects the genesis file to follow the <chain-id>-genesis-l2.json pattern.
Tests

No tests, this is a script fix.

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[krofax]

Resolved, thanks