### What?
Allows to indent children in richtext-lexical if the parent of that
child is not indentable. Changes the behavior introduced in
https://github.com/payloadcms/payload/pull/11739
### Why?
If there is a document structure with e.g. `tableNode > list > listItem`
and indentation of `tableNode` is disabled, it should still be possible
to indent the list items.
### How?
Disable the indent button only if indentation of one of the selected
nodes itself is disabled.
babf4f965d