wifi: add test for tracking Passpoint AP on devices with Passpoint disabled

On a device with Passspoint disabled (config_wifi_hotspot2_enabled build config
set to false), calls to WifiManager#getMatchingWifiConfig will throw
an UnsupportedOperationException.  So add a test to verify that exception
is being caught in WifiTracker#udpateAccessPoints.

Bug: 36649203
Test: runtest --path
      frameworks/base/packages/SettingsLib/tests/integ/src/com/android/settingslib/wifi/WifiTrackerTest.java

Change-Id: If7d3d4122c36b1b98c24abf703d6492771918125