Fixes to undroppable tree nodes

[rpiaggio]

This PR fixes 2 issues with Tree nodes with droppable === false:

When there's a node with droppable: false:

• The drop point before said node would render and be active, but if you dropped another node on said drop point, it would not call onDragDrop and the drop point will remain active. (UITreeNode: onDropPoint should execute even when props.node.droppable === false. #6976).
• The drop points within said node would render, making it effectively possible to drop into it (despite it having droppable: false).

Fix #6976

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