Fix WiFi + "x" stil visible

The WiFi + "x" still seems to appear under some conditions - code
path checking on changes in status not triggered correctly.

Also remove one of the calls to the WifiManager#getCurrentNetwork.
Partial fix to WifiManager#getCurrentNetwork blocking.

Bug: 161011371
Bug: 163425287
Test: atest NetworkControllerWifiTest
Test: visual inspection
Change-Id: I112bdff85e905807c4e2826c127aeaedcdb03fd1