Fade track is not affected by "Restore State" flag

Fade track is not affected by "Restore State" flag

Regression: Sort of. Restore State wasn't available in 4.14, but the default behavior would leave the screen black
Worked: 3249277 (4.14.3)
Broken: 3348071 (4.15.1)

1. Create a sequence
2. Add a fade track
3. Key the fade track from 0 to 1 over the course of the timeline
4. Place the sequence in the level with Auto-Play enabled and RestoreState disabled
5. PIE

Result: At the end of the sequence, the screen will be black, then pop back to normal
Expected: Screen remains black