toc_js_per_node active default value only applied in node form, not via entity API

Problem/Motivation

In the module toc_js_per_node we can specifiy the default override value on the node edit form. But it works only on the UI side.

The toc activation default value is not applied to the underlying field and by consequence not applied when creating a node programmatically.

Proposed resolution

Define a BaseFieldOverride that checks the third party setting of the corresponding node type for its default value.