Disable the sync now menu while no any synced item

- Check the number of the switch on for all SyncStateSwitchPreferences to
  enable/disable the sync now menu item.

Fixes: 147030748
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.accounts
Change-Id: I88e4b042e6d236b98866b9e8bff9ec2c64b41b87

src/com/android/settings/accounts/AccountSyncPreferenceController.java

@@ -66,8 +66,8 @@ public class AccountSyncPreferenceController extends AbstractPreferenceControlle
         new SubSettingLauncher(mContext)
                 .setDestination(AccountSyncSettings.class.getName())
                 .setArguments(args)
-                .setSourceMetricsCategory( SettingsEnums.ACCOUNT)
-                .setTitleRes( R.string.account_sync_title)
+                .setSourceMetricsCategory(SettingsEnums.ACCOUNT)
+                .setTitleRes(R.string.account_sync_title)
                 .launch();
 
         return true;