Visualizer tweaks

- Show visualizer even when sliding panels
- Hide visualizer in power save mode
- Ignore first 2 bytes of FFT Data - they are quite random
- Hide visualizer in landscape mode
- Reduce color update delay

Change-Id: I90f1a442db2f56f0e4075ff096711c163626731b
Signed-off-by: Utkarsh Gupta <utkarsh.eminem@gmail.com>