Changing LayerDrawable to RippleDrawable in XML

Turns out that one change caused quite significant regression for number of missed frames while reinitializing quick settings.
I'm not sure why RippleDrawable would improve performance but the improvement with this change is consistent.

Fixes: 339412453
Flag: com.android.systemui.qs_tile_focus_state
Test: ToggleDarkThemeMicrobenchmark

Change-Id: I9fe11cf911cb61ad07abda07b500e4772fa42ad1