Fix redesigned gesture nav jank

- Removed the fake animated taskbar view from the redesigned tutorial flow
- Fixed the hotseat and home icon colors from the overview step

Flag: ENABLE_NEW_GESTURE_NAV_TUTORIAL
Bug: 279823249
Fixes: 281121701
Fixes: 283310758
Test: swiped up from home/overview step
Change-Id: Ie659495994f0c935c5b6c6bf1ae534ec51521726