msim: initialize sim icon to the known state

- When system ui gets killed (for instance, during a theme change),
  MultiSimNetworkController may not receive the SIM_STATE_CHANGED
  for both sim cards.  Instead of initializing the sim to "ready",
  query for the actual state at initialization

Change-Id: Ia7f63827bbddca77de3daf4d5d149ec79ab91d5d