[Wi-Fi] Show Pie+x Wi-Fi icon when a connected Wi-Fi is not default route

This change shows Pie+x Wi-Fi icon in Wi-Fi Details for a connected Wi-Fi
network which is not the default network when

  1. It's connection speed quality is bad.
  or
  2. It has certain internet connection problem.

Bug: 163627176
Test: make RunSettingsRoboTests ROBOTEST_FILTER=WifiDetailPreferenceController2Test
      manual visual
Change-Id: I1f102471426a55c7dabd9110afba20f802abedbe