Fix Settings crash

- When user leaves WiFi control page, ApplicationState session
is onpause(), and removes all handler callback. But if a callback
is fired, remove callback can not remove it. Therefore Wifi callback
is received in Special app access page which is loading DataUsageState.
It caused object cast error because wifi callback want to cast
DataUsageState data to WifiSettingsState.
- The solution is do not rebuildList in paused state.

Fixes: 141321483
Test: manual, robolectric
Change-Id: I6690277932ccfcd332fc1432feafbc907fc79524