Fix incorrect app count displayed under special app access

- This special app Google Play services will change its hasLauncherEntry
  value after receiving the MSG_LOAD_LAUNCHER.
- Update the summary while SpecialAppAccessPreferenceController is
  receiving the onLauncherInfoChanged callback.

Fixes: 150480524
Test: manual test
Change-Id: I26b99fce54606644ee5603b4ca4730267c0f7ce5

src/com/android/settings/applications/SpecialAppAccessPreferenceController.java

@@ -144,10 +144,11 @@ public class SpecialAppAccessPreferenceController extends BasePreferenceControll
 
     @Override
     public void onLauncherInfoChanged() {
+        // when the value of the AppEntry.hasLauncherEntry was changed.
+        updateSummary();
     }
 
     @Override
     public void onLoadEntriesCompleted() {
     }
-
 }