Force update APs when enabling wifi in WifiSettings.

This reverts commit b2bdc8f1
and fixes a broken Espresso test case.

Reason for revert: Rolling forward after fix in ag/2133493, to fix b/37324736

Bug: b/37324736
Test: runtest --path
packages/apps/Settings/tests/unit/src/com/android/settings/wifi/WifiSettingsUiTest.java

Change-Id: I9cdf8cb1043af5d527eccbd9cc56d3b02419d7ac