Autoclick: Fix Autoclick dragging

Both the BUTTON_PRESS and BUTTON_RELEASE event needed their action
button set for text/drawing dragging to work properly.

Demo: http://b/421940081#comment2

Bug: b/421940081
Test: AutoclickControllerTest
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: I5de13edd49ad078473819b3d2cf8415c84d58873