[CurveEditor] Pasting keys in curve editor paste all keys instead of selected keys.

Repro:
1- Open attached project.
2- Open scene 'Repro'.
3- Select Cube game object.
4- In animation window, select property position.
5- In curve editor select second key frame on x,y,z curves.
6- Move playhead elsewhere and paste keys.

You'll see that all keys in curves x,y,z have been pasted instead of selected keys.

License type: Pro