ncli_db: use fork from runtimeconfig when verifying era file (#4689)

Sepolia in particular goes through two hard forks during era 1, meaning
the phase0 fork is no longer part of the state, even though blocks that
belong to it still are phase0.

beacon_chain/era_db.nim

@@ -220,7 +220,7 @@ proc verify*(f: EraFile, cfg: RuntimeConfig): Result[Eth2Digest, string] =
 
           # Batch-verification more than doubles total verification speed
           sigs.add block_signature_set(
-              getStateField(state[], fork),
+              cfg.forkAtEpoch(slot.epoch),
               getStateField(state[], genesis_validators_root), slot,
               blck[].root, cooked.get(), sig.get())