Treat VPN-over-wifi default network as Wi-Fi default

If the current default network is VPN-over-wifi, then we should treat
the underlying wifi network as the default network and show wifi as
connected (same as the status bar logic).

Bug: 289760628
Test: atest WifiPickerTrackerTest
Change-Id: I786e4d596491dd3916c61385c031db3eb1fa1681
2 files changed