As of #13631, statically defined live preview URLs become corrupt after
the first save.
For example, if you define your URL as a string like this:
```ts
import type { CollectionConfig } from 'payload'
const MyCollection: CollectionConfig = {
// ...
admin: {
livePreview: {
url: '/hello-world'
}
}
}
```
On initial load, the iframe's src will evaluate to `.../hello-world` as
expected, but from the first save onward, the url becomes
`.../undefined`.
This is because for statically defined URLs, the `livePreviewURL`
property does not exist on the response. Despite this, we set it into
state as undefined. This is true for both collections and globals.
Initially reported on Discord here:
https://discord.com/channels/967097582721572934/967097582721572937/1421166976113442847
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