[Wi-Fi] Ignore incorrect user certificates

These incorrect user certificates displayed when users
editing a Wi-Fi network of WPA3-Enterprise in 192bit.

Bug: 149763958
Test: make RunSettingsRoboTests ROBOTEST_FILTER=WifiConfigControllerTest
      make RunSettingsRoboTests ROBOTEST_FILTER=WifiConfigControllerTest2

Change-Id: Iab35ac975933abc54fda83b99a2109d53d6722d4