[Provider Model] Move down the Internet unavailable Wi-Fi

- Move down the Internet unavailable Wi-Fi to the top of the available
Wi-Fi networks

- Don't paint color for the Internet unavailable Wi-Fi

- Screenshot:
  https://screenshot.googleplex.com/94NotfJLKXSbBW9

Bug: 178457619
Bug: 178926547
Bug: 178978070
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest

Change-Id: I1c98e2a8793ce9dc2fb886c0fa66f4297a34ab01