Correct check of is user running

Before the ActivityManagerService sends an intent or
starts an activity it checks if target user is in
mStartedUsers array.

When removing a non-owner user process the
UserStartedState instance will still be in mStartedUsers
array with mState STOPPING or SHUTDOWN.

This should be checked before sending an intent or start
an activity.

isUserRunningLocked(...) will interpret mState STOPPING
and SHUTDOWN as a non running user.

Change-Id: I1b51bcdb62bdd0f6dbe05dab4d529d4ad40d0d44