Call completeResumeLocked after activity is resume-relaunched

This is only needed when we're resuming an activity in
resumeTopActivityInnerLocked. If the activity is being resume-
relaunched elsewhere, we don't need to check this.

Also make sure RESUMED state is only set in ActivityStack#
setResumedActivityLocked.

Change-Id: If4be211f9ded7e5057257563ffc566cd4d65fb33