a11y: Remove indicator when hovering on directional buttons

Autoclick indicator appears on all scroll panel buttons, causing visual
distraction during scrolling. We should remove the indicator when it is
on directional buttons.

Video: http://shortn/_XJT8X9VxAF

Bug: b/403624552
Test: AutoclickControllerTest
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: Ia0fb0387e6e1d3ee1cf846a8c7dfaa9f0967fd51