chore: fix check balance script

[npty]

Description

This PR fixes the npm run check-balance local script by correcting chain config parsing logic.

Test

1. Run npm run start
2. Run npm run check-balance local

The output is the following:

==== Print balances for local =====
Wallet address: 0x2859f7d17DA8023A760B5EF825C8626F9c33227a 

Native tokens:
Moonbeam: 100.0
Avalanche: 100.0
Fantom: 100.0
Ethereum: 100.0
Polygon: 100.0

aUSDC tokens:
Moonbeam: 1000000000000.0 aUSDC
Avalanche: 1000000000000.0 aUSDC
Ethereum: 1000000000000.0 aUSDC
Fantom: 1000000000000.0 aUSDC
Polygon: 1000000000000.0 aUSDC