Fix use after free in redo of "Create Custom Bone2D(s) from Node(s)" #99800
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Fixes #97652
Using "queue_free" on the undo of the creation of the Bone2D meant that on the redo the Bone2D was already deleted.
Replaced it with "add_do_reference", so when the Action of the undo_redo is destroyed, also destroys the Bone2D.