chore: fix init_node script(grpc-web port) - Triage finschia-sdk#501

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Desc

• modify init_node script for grpc_gw port setting

Suggestion(Abandon/Maintain/Submit)

• Maintain: finschia-sdk

Links

• chore: fix init_node script(grpc-web port) finschia-sdk#501

[jaeseung-bae]

todo: replace upstreams script if there is better one

[jaeseung-bae]

todo: replace upstreams script if there is better one

Found, Try to replace with upstream's one cosmos-sdk/scripts/init-simapp.sh

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anyone who is dealing with this issue, please refer to todo
todo: check default config for grpc port number then abandon or not.