Curve editor (UMG) prevents Play in Editor if the a drag operation is interrupted with a right click

Curve editor (UMG) prevents Play in Editor if the a drag operation is interrupted with a right click. The user is given an error that they cannot play in editor while a drag operation is still on going. However, the user is no longer performing a drag operation.

1. Open the editor
2. Create a new widget blueprint
3. Add a widget to the designer tab
4. Create a new animation
5. Create an animation for the widget
6. Select Curve editor
7. Select a key and drag it around
8. Right click while dragging
9. Try to play in editor
10. Notice an error is given "Can't play in editor when performing Mouse Drag Operation"

Expected: The curve would be set and the drag would be canceled once the play in editor button is pressed
Result: The user can no longer play in editor

Fix UE-51650

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