Do not select hint indicator when talkback is enabled.

This prevents "Selected" from being announced but prevents the text from scrolling (not as important when talkback is enabled).

Fix: 210363098
Test: manual (use biometric prompt with talkback on/off and verify text only scrolls when off)
Change-Id: I7d77cd871d8d8e817f418aea0c6ce9c5153a5b60