Stops updating A11yUserState on ACTION_USER_PRESENT.

This was useful when the A11yUserState was temporarily modified
while the keyguard was on. However, ever since the a11y gesture
from commit 106fe732
the A11yUserState is no longer temporarily modified this way.

Bug: 247045101
Test: a11y presubmit tests
Change-Id: I6fde21fe84cea3cae5f0dfa86fcd811a22542cc5