[Settings] Avoid mobile data usage init in WiFi usage

Avoid from initial in WiFi usage and update into mobile data usage after
refresh.

Bug: 151751844
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=DataUsageSummaryPreferenceControllerTest
Change-Id: Ic6176952953ded9d47f1fc52c3f311e6568a5b90

src/com/android/settings/datausage/DataUsageSummaryPreferenceController.java

@@ -114,6 +114,7 @@ public class DataUsageSummaryPreferenceController extends TelephonyBasePreferenc
      */
     public void init(int subscriptionId) {
         mSubId = subscriptionId;
+        mHasMobileData = DataUsageUtils.hasMobileData(mContext);
         mDataUsageController = null;
     }
 
@@ -123,8 +124,6 @@ public class DataUsageSummaryPreferenceController extends TelephonyBasePreferenc
                 context.getSystemService(NetworkPolicyManager.class);
         mPolicyEditor = new NetworkPolicyEditor(policyManager);
 
-        mHasMobileData = DataUsageUtils.hasMobileData(context);
-
         mDataUsageController = new DataUsageController(context);
         mDataUsageController.setSubscriptionId(subscriptionId);
         mDataInfoController = new DataUsageInfoController();