Add token to user tokens list when editing native asset visibility if token is not in list

[josheleonard]

Description

Currently, in the edit visible token modal, we always list a network's native token, even when the user does not have that token in their tokens list. This prevents the asset's visibility to be changed. We should add the token to the user's token list when attempting to modify the token's visibility, so that we can track the visibility modification.

Steps to Reproduce

1. Add a new chain to the wallet (do not add any new native assets)
2. Open the visible assets modal
3. hide the native asset
4. refresh the page
5. open the visible assets modal again

Actual result:

Asset will still be visible

Expected result:

Asset should be hidden

Reproduces how often:

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release?
• Can you reproduce this issue with the beta channel?
• Can you reproduce this issue with the nightly channel?

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

[kjozwiak]

The above requires 1.62.165 or higher for 1.62.x verification 👍

[srirambv]

Verification passed on

Brave	1.62.165 Chromium: 121.0.6167.184 (Official Build) (64-bit)
Revision	646e9a49ef45084cb2341eb1e9afabc339004a27
OS	Windows 11 Version 23H2 (Build 22631.3155)

• Verified steps from issue description
• Verified added user token visibility status is retained between page reloads

35149.mp4