Duplicating a Possessable Track in Sequencer should duplicate the bound actor and bind the duplicate track to it

Duplicating a possessable object binding in Sequencer causes a new sub track added to the existing possessable with a missing binding. It's unclear what the behavior should be here, as duplicating a possessable would also mean duplicating the object in the level.

1. Add a possessable to a level sequence
2. Select the the possessable in Sequences
3. Duplicate with ctrl+w

RESULT:
A new subtrack is added to the existing possessable with a missing object binding. It's expected that a new object binding would be created as a new track, or that nothing would happen at all.

NOTE: In 4.22 the new object binding is still missing, but created as a new track, not as a subtract to the original object binding.