Fix Talkback should not announce disruptive announcement

"Re-enter your PIN" page.

Remove the calling announceForAccessibility() to prevent disruptive
announcement.

Flag: EXEMPT bugfix

Bug: 383259346
Bug: 384608181

Test: local build and verify Talkback announcement in
"Re-enter your PIN" page.

Change-Id: Ide29dde477a095db12eb959dc3d89b6689bd6ab2

src/com/android/settings/password/ChooseLockPassword.java

@@ -770,7 +770,7 @@ public class ChooseLockPassword extends SettingsActivity {
             // If the stage changed, announce the header for accessibility. This
             // is a no-op when accessibility is disabled.
             if (previousStage != stage) {
-                mLayout.announceForAccessibility(mLayout.getHeaderText());
+                getActivity().setTitle(mLayout.getHeaderText());
             }
         }