rt-app: fix classifer update
rt-app: fix classifer update

rt-app inserts its own classifiers into the results. Previosly, if was
replacing the existing classifier if there were any. Now, classifiers
are updated, rather than replaced.

jimboatarm/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation,bjackman/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation,jimboatarm/workload-automation,bjackman/workload-automation