Do update signal icon for -1 level in AddAppNetworksFragment am: baf2ef0be6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/17511482

Change-Id: I50e3649c21bb83ee9130fa98a71560fe261198a9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

src/com/android/settings/wifi/addappnetworks/AddAppNetworksFragment.java

@@ -414,6 +414,9 @@ public class AddAppNetworksFragment extends InstrumentedFragment implements
     }
 
     private void updateSingleNetworkSignalIcon(int level) {
+        if (level == WifiEntry.WIFI_LEVEL_UNREACHABLE) {
+            return;
+        }
         // TODO: Check level of the network to show signal icon.
         final Drawable wifiIcon = mActivity.getDrawable(
                 Utils.getWifiIconResource(level)).mutate();