Do no convert FaceSettingsAttention to slice.

The check logic of this preference requires a page loading prior to
slice auto convertion, so it is not suitable to become a slice.
Converting it to a slice will lead to an app crash.

Fixes: 145723632
Test: robotests
Change-Id: Ie6eafb244e9a1cc9267f6b747c8e357d239e688e

src/com/android/settings/biometrics/face/FaceSettingsAttentionPreferenceController.java

@@ -26,7 +26,6 @@ import androidx.preference.PreferenceScreen;
 import androidx.preference.SwitchPreference;
 
 import com.android.settings.Utils;
-import com.android.settings.core.TogglePreferenceController;
 
 /**
  * Preference controller that manages the ability to use face authentication with/without
@@ -117,6 +116,11 @@ public class FaceSettingsAttentionPreferenceController extends FaceSettingsPrefe
         return true;
     }
 
+    @Override
+    public boolean isSliceable() {
+        return false;
+    }
+
     @Override
     public int getAvailabilityStatus() {
         return AVAILABLE;