Fixed the ListView's keyboard navigation on runtime.
Reproduction steps:
1. Open the attached “BugTest” project
2. Open the “Assets/Test Scene.unity” Scene
3. Enter the Play Mode
4. Click on the ListView item in the Game view
5. Navigate through list items using the up/down arrow or WASD keys
Expected result: Smooth navigation through ListView items using arrow or WASD keys
Actual result: Navigation through ListView items using Arrow or WASD keys only advances one item