Change the icon for the LOGGED_IN notification.

This notification is shown when the user has already logged in to
the network, so it should not have a question mark on it.

Fix: 130526201
Test: atest FrameworksNetTests
Test: manually signed in to portal
Change-Id: I8250236bc4ba251492a6cb9bf23e67666ef860d3
Merged-In: I8250236bc4ba251492a6cb9bf23e67666ef860d3
(cherry picked from commit fce36355)