Add USDT-BEP20 icon

[shailaquarious85]

[!NOTE] Add USDT-BEP20 token icon assets, including chain-specific icon at icons/eip155:56/erc20:0x8Ff6188cB5C761C8269AEAd8AA6356504B08249B.png.

^{Written by Cursor Bugbot for commit d1580afddeff9b2b5d075b18ac7fd662bde40da1. This will update automatically on new commits. Configure here.}