[ADD] TGT token to token whitelist

Mainnet:

THORWallet Governance Token: https://etherscan.io/token/0x108a850856db3f85d0269a2693d896b394c80325

Testnet:

THORWallet Governance Token: https://ropsten.etherscan.io/token/0x73d6e26896981798526b6ead48d0fab76e205974