Needed for #12860.
The new live preview pattern requires collection-level preferences, a
pattern that does not yet exist.
Instead of creating a new record for these types of preferences, we can
simply reuse `<collectionSlug>-list` under a more general key:
`collection-<slug>`. This way other relevant properties can be attached
in the future that might not specifically apply to the list view.
This will also match the conventions already estalished by
document-level preferences in `collection-<slug>-<id>` and
`global-<slug>`.
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c8b72141e4