[Bug]: Cannot search for networks anymore when its not connected to an app

### Describe the bug

Network search is enabled when metamask is connected to an app

But in the default networks section under the tokens, its not searchable. It makes it harder to find the right ones, when you have a lot of networks

### Expected behavior

_No response_

### Screenshots/Recordings

_No response_

### Steps to reproduce

Where it works:
1. connect the metamask to an app (example: https://etherscan.io/token/0xB8c77482e45F1F44dE1745F52C74426C631bDD52#writeContract)
2. click Managed networks to see the search at the top

Where it doesnt:
1. click on the networks under tokens

2. the search doesnt appear under for neither popular nor Custom section

### Error messages or log output

```shell

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### Where was this bug found?

Live version (from official store)

### Version

13.28.0

### Build type

None

### Browser

Brave

### Operating system

MacOS

### Hardware wallet

_No response_

### Additional context

_No response_

### Severity

_No response_

Start by reproducing the issue in MetaMask 13.28.0 in Brave on macOS: compare Managed networks after connecting to an app with the Networks view under Tokens when disconnected. Confirm whether search is absent in both Popular and Custom sections. Done means network search is available and works in the disconnected Tokens view as it does in Managed networks.

Written by the indexing model from the issue text.