Summary:
The code used the hovered node and selected node somewhere inconsistently for keyboard controls, this led to subitle bugs where if you moused over the next keybaord jump point would be the hovered node sometimes. This straightens it all out
Changelog: [UIDebugger] Fixed bug with keyboard tree controls
Reviewed By: aigoncharov
Differential Revision: D47832249
fbshipit-source-id: 7697c97a817ed5b70250c0c4f12fc1c59bdb96b9