Fix FalsingManager when a11y is on.

Replaces AccessibilityManager.isEnabled() with
AccessibilityManager.isTouchExplorationEnabled(), which is more
correct. The wrong method was selected when it was first checked in.

Fixes: 203034281
Test: manual
Change-Id: Ic73d535df98a15e0771fb394e91d2191f834f5c2
2 files changed