Fix people chain spec parsing in chainspec generator #1696

Job	Run time
Extract tasks from matrix	3s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://polkadot-try-runtime-node.par...	12m 53s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://kusama-try-runtime-node.par...	9m 58s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	6m 46s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	11m 34s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	6m 5s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	6m 55s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	4m 56s
check-migrations (coretime-kusama, coretime-kusama-runtime, system-parachains/coretime/coretime-k...	3m 56s
check-migrations (encointer-kusama, encointer-kusama-runtime, system-parachains/encointer, wss://...	4m 33s
	1h 7m 39s

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