Revert "Persist implicit overlay configurator actor policy"

This reverts commit af93f5de.

The overlays.xml file version should not be reverted to 3.
Increasing the version caused b/158054824 so for devices that have not
upgraded to version 4, do not ignore a version 3 overlay file when
restoring settings. In a future change, we must create testing so that
version upgrades always migrate old overlays.xml files to new
overlays.xml files.

Bug: 157266239
Bug: 158054824
Change-Id: I3f8c49d30a1961a756bbed9b2ab01aeb1f887e55