Attempt #2. Fix OutlineProvider for PageIndicatorDots for new visual updates.

This attempt puts 100% of the change behind a flag and doesn't round any values.

Bug: 394355070
Test: Verified locally that the active indicator is outlined properly.
Flag: com.android.launcher3.enable_launcher_visual_refresh
Change-Id: I6e610cb8a5ad9914d3152ef0019fcb5f50c331c3