Draw currently connected network in Picker.

Make sure to call refresh when adding the Access Point Preference to the
WifiPicker's Connected Access Point Category. This will case the icon
and the title to be drawn.

Bug: 35388267
Test: None. Too difficult without robolectric testing which requires
refactor.

Change-Id: I7949733f8ca7f904327872df54f6963c723bc704