[DO NOT MERGE][Wi-Fi] Fix fatal exception in WifiConnectionPreferenceController

WifiConnectionPreferenceController only shows when there are 2 SIMs,
it shows the connected Wi-Fi network.

WifiConnectionPreferenceController does not use WifiPickerTracker
to get a WifiEntry key. It should not launch WifiNetworkDetailsFragment2
which uses a WifiEntry key to find a WifiEntry.

Bug: 168280554
Test: manual
      1. Make MultiNetworkHeaderController available.
      2. Settings -> Network & internet -> click connected Wi-Fi
      3. See Wi-Fi Details
Change-Id: I2acea3564d2d89fe8e120064b33ef342c97edb60