Fix #23304 - Only use Confusable during send with ENS

[darkwing]

Description*

We should only be using Confusable for AddressListItem when the user is entering an unknown address during the send flow or adding a contact.

Related issues

Fixes: #23304

Manual testing steps

1. Open the new send flow
2. Type metamask.eth
3. See red 'm's, noting that they could be a rn
4. Type vitalik.eth
5. See no red characters since there are no confusable letter combinations there
6. Look at your contact list
7. Any contact with an m should not have red text

Screenshots/Recordings

Before

Available in issue

After

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've clearly explained what problem this PR is solving and how it is solved.
• I've linked related issues
• I've included manual testing steps
• I've included screenshots/recordings if applicable
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.
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  • In case it's not yet "ready for review", I've set it to "draft".
  • In case it's "ready for review", I've changed it from "draft" to "non-draft".

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

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