[Expressive Battery] Tweak the animation of Battery Usage screen.

Fix the blinking while tapping chart to select time intervals.
- setHasStableIds(true) to avoid BatteryChartView create viewHolder again when SettingsPreferenceGroupAdapter invoke notifyDataSetChanged()

Recover the fade-in animation when display the hourly chart for the first time.
- set the default alpha of hourly chart in xml to 0.

Bug: 378997970
Bug: 349652542
Flag: EXEMPT bug fix
Test: visual
Change-Id: Ia6c131452fca65db7149664c7e18ca68e9703def