Lexical nested fields are currently not set-up to handle access control
on the client properly. Despite that, we were passing parent permissions
to `RenderFields`, which causes certain fields to not show up if the
document does not have `create` permission.
Previously, the lexical link drawer did not display any fields if the
`create` permission was false, even though the `update` permission was
true.
The issue was a faulty permission check in `RenderFields` that did not
check the top-level permission operation keys for truthiness. It only
checked if the `permissions` variable itself was `true`, or if the
sub-fields had `create` / `update` permissions set to `true`.
