Always set the suite info update flag if a task state changes.

This fixes a minor bug in simulation mode: the suite state summary would
not be updated for 'running' if nothing else was happening at the time,
because in sim mode this state change is not caused by an incoming task
message (which does always result in a state summary update).
Merge pull request #909 from hjoliver/set-info-flag-on-state-change

Always set the suite info update flag if a task state changes.