Is hovered for a scroll box does not switch back to false when no longer hovering

If the user uses the is hovered node with a scroll box, the node will return true no matter what once the scroll box has been hovered once.

1. Open the editor
2. Create a new widget blueprint
3. Add a scroll box to the designer tab
4. Resize it so the it will be easy to hover over
5. Create the blueprint in the attached image
6. Save and compile
7. Open the level blueprint
8. Add the widget to the viewport (level_blueprint.png)
9. Save
10. Play in editor
11. Use Shift+F1 to show mouse
12. Hover over the section containing the scroll box
13. Quickly move the mouse away
14. Notice that the print string continues to print

Expected: The print string would no longer print after the mouse in no longer over the scroll box (meaning is hovered should be set to false but it is not)
Result: The print sting will continue printing (because is hovered is returning true)