Make the fragment title can’t searchable

we shouldn't take users so deep into the settings IA because it's easy
to feel lost in settings after clicking on a result without additional
context.

Bug: 143055215
Test: robotest & manual
Change-Id: I337cb5ead31e1e4e7bf9be78132e90630f83ee43

src/com/android/settings/language/TtsPreferenceController.java

@@ -38,7 +38,6 @@ public class TtsPreferenceController extends BasePreferenceController {
     public int getAvailabilityStatus() {
         return !mTtsEngines.getEngines().isEmpty() &&
                 mContext.getResources().getBoolean(R.bool.config_show_tts_settings_summary)
-                ? AVAILABLE_UNSEARCHABLE
-                : CONDITIONALLY_UNAVAILABLE;
+                ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
     }
 }