fix(cli): add chain-id to PrepareGenesis cmd (#1393)

## What is the purpose of the change

The PR fix the `PrepareGenesis` cmd

## Brief change log

* fix(cli): add chain-id to PrepareGenesis cmd

## Testing and Verifying

Manually verified the change

## Documentation and Release Note

  - Does this pull request introduce a new feature or user-facing behavior changes? NO
  - Is a relevant changelog entry added to the `Unreleased` section in `CHANGELOG.md`? NO
  - How is the feature or change documented? not applicable

(cherry picked from commit 4b12425)

cmd/osmosisd/cmd/genesis.go

@@ -108,6 +108,7 @@ func PrepareGenesis(clientCtx client.Context, appState map[string]json.RawMessag
 	cdc := depCdc.(codec.Codec)
 
 	// chain params genesis
+	genDoc.ChainID = chainID
 	genDoc.GenesisTime = genesisParams.GenesisTime
 
 	genDoc.ConsensusParams = genesisParams.ConsensusParams