Update asset_transfer_ledger_chaincode.js

the `let` def wont get the object of asset, and generate an error when init the ledger

Signed-off-by: James <james.gong927@gmail.com>

asset-transfer-ledger-queries/chaincode-javascript/lib/asset_transfer_ledger_chaincode.js

@@ -386,7 +386,7 @@ class Chaincode extends Contract {
 			},
 		];
 
-		for (let asset in assets) {
+		for (const asset of assets) {
 			await this.CreateAsset(
 				ctx,
 				asset.assetID,