fix: Correct conditions for triggering name lookup during send (#27880)

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Take changes from
5e08c06

## **Description**

Hotfixes a problem preventing certain name resolution Snaps from being
triggered due to faulty `IS_FLASK` conditions in `12.4.1`. These
conditions were removed in
#26242. This PR picks
these changes from the previously mentioned PR, without touching the ENS
integration.

The problem in question occurs when trying to trigger name resolution
for a given input. `lookupDomainName` is never called on stable unless
the input looks similar to an ENS name. This prevents resolution of
inputs that don't use TLDs for instance.

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## **Manual testing steps**

1. Use a build of stable
2. Install https://snaps.metamask.io/snap/npm/social-names-snap/
3. See that you can resolve a Farcaster name using that Snap, e.g.
`fc:frederik`
4. Check that you can also type a valid ENS name
5. Check that you can also type a valid address

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Co-authored-by: Hassan Malik <[email protected]>