Copying and Pasting transform tracks creates a second transform track in Sequencer

When testing the new features in 4.15, i noticed that when copying and pasting a transform track in Sequencer, and pasting the transform track to an actor, it adds another transform track rather than replacing it.

1. Open any project
2. Add a cube to the level
3. Create a new level sequence and add the cube
4. Add a key to the transform track
5. Scrub the timeline to 30, move the cube and add a second key
6. Right click on the transform track and select copy
7. Right click on the cube track and select paste

Result: A second transform track is added to the cube track

Expected Result: The pasted values replaces the existing transform track

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