Display connected AP when there are no scanresults

Bug: 68030053
Test: runtest --path
    frameworks/base/packages/SettingsLib/tests/integ/src/com/android/settingslib/wifi/WifiTrackerTest.java
1. Visual verification of UI when opening WifiSettings directly from
screen off longer than 5 minutes (no scan results scenario).

Change-Id: I7e4d9a3abb861b485b0a952a1a4b822f2460bdc2