AOD: Fix LockIcon click handler

Fixes an issue where the click action of the LockIcon was inconsistently
handled:
- clickable if touch exploration or trust agent is active
- click action is unlock if accessibility enabled

This lead to a bug where unlocking with an accessibility service on that icon
was not possible unless a trust agent or touch exploration was enabled.

Change-Id: I3141afb8ed7ed5a07481f6ae35477f0e11cc5b02
Fixes: 37363764
Test: Enable accessibility and trust agent, verify click disables trust instead of unlocking.