[Bug]: Need to add an icon to the Ultron network

### Describe the bug

**Ultron network has no icon in Metamask**

Need to add the icon to the Ultron network.

**Icon:** https://ultron.foundation/logo.png

**Ultron network mainnet:**
Network name: Ultron
New RPC URL: https://ultron-rpc.net
Chain ID: 1231
Currency symbol: ULX
Block explorer URL: https://ulxscan.com/

**Ultron network testnet:**
Network name: Ultron(T)
New RPC URL: https://ultron-dev.io
Chain ID: 1230
Currency symbol: ULX
Block explorer URL: https://explorer.ultron-dev.io/

### Steps to reproduce

1. Add Ultron network to Metamask
Network name: Ultron
New RPC URL: https://ultron-rpc.net
Chain ID: 1231
Currency symbol: ULX
Block explorer URL: https://ulxscan.com/
2. Open the metamask and see that the Ultron network has no icon

### Error messages or log output

_No response_

### Version

10.28.2

### Build type

None

### Browser

Chrome, Firefox, Microsoft Edge, Brave, Other (please elaborate in the "Additional Context" section)

### Operating system

Windows, MacOS, Linux, Other (please elaborate in the "Additional Context" section)

### Hardware wallet

_No response_

### Additional context

_No response_

Start by locating the repository's network icon handling and use the supplied Ultron logo URL and chain IDs 1231 and 1230 as references. Confirm the change by adding the icon for both networks and checking that MetaMask displays it when each network is selected.

Written by the indexing model from the issue text.