Cleaning up deprecated QS tooltip code

Flag is rolled out, so tooltips other than font size shouldn't show anymore.
Much code can be removed.

Flag: EXEMPT code cleanup
Test: atest com.android.settings.accessibility
Bug: 367414968
Change-Id: I55084982fee0d0537aade49d36f52e121e24574b

src/com/android/settings/accessibility/LaunchAccessibilityActivityPreferenceFragment.java

@@ -71,11 +71,6 @@ public class LaunchAccessibilityActivityPreferenceFragment extends ToggleFeature
         return view;
     }
 
-    @Override
-    protected void onPreferenceToggled(String preferenceKey, boolean enabled) {
-        // Do nothing.
-    }
-
     @Override
     protected void onProcessArguments(Bundle arguments) {
         super.onProcessArguments(arguments);