Fix crash in clicking Default Home gear icon.

- change the way that default home query the resolve activity to only
check for LAUNCHER activity.

Change-Id: Ib53154afe7951f4e2c7c3ab147be4c691113e0e7
Fixes: 112249115
Test: make RunSettingsRoboTests

src/com/android/settings/applications/defaultapps/DefaultHomePreferenceController.java

@@ -105,7 +105,7 @@ public class DefaultHomePreferenceController extends DefaultAppPreferenceControl
         Intent intent = new Intent(Intent.ACTION_APPLICATION_PREFERENCES)
                 .setPackage(packageName)
                 .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
-        return mPackageManager.queryIntentActivities(intent, 0).size() == 1 ? intent : null;
+        return intent.resolveActivity(mPackageManager) != null ? intent : null;
     }
 
     public static boolean hasHomePreference(String pkg, Context context) {