[Bug]: MUSD token not shown in the tokens list

### Describe the bug

The tokens list does not show the musd token even when the token has balance.

### Expected behavior

_No response_

### Screenshots/Recordings

https://github.com/user-attachments/assets/e4babd51-974a-4320-9cce-d1a559a43f93

### Steps to reproduce

1. Login to the app
2. Scroll through the tokens list

### Error messages or log output

```shell

```

### Where was this bug found?

Internal release testing

### Version

7.81.0

### Build number

5334

### Build type

None

### Device

iphone 15

### Operating system

iOS

### Additional context

_No response_

### Severity

_No response_

No source file, test, or entry point is named. Reproduce the issue on iOS with MetaMask Mobile 7.81.0/build 5334 and a wallet holding MUSD, then trace the token-list flow; done means MUSD appears in the list when it has a balance.

Written by the indexing model from the issue text.